GOALS AND PREGAME INSPECTION

Question:
I had a question on what constitutes “superfluous items” on a goal post. I was officiating a game the other weekend when the ball bounced off the wheels attached to the goalposts (these are the movable goals), and in the subsequent play the attacker scored a goal. The defenders said that the ball had hit the wheel (that was attached to the goalpost) and came back unto the field of play. I talked to the AR and after the discussion allowed the goal to stand. At half time we went over to the goal post and put the ball down in front of the wheel and noticed that the wheel was placed in such a way that the ball never left the field of play, that part of the ball was on the goal line.

However, I was just reading the ATR and noticed that 1.7.b noted those items that were “non-regulation apparatus” and if the ball touched these items that the ball should be considered out of play, regardless of the ball rebounding back into the field of play.

The question I have is should I have consider the wheel attached to the goalpost to have been a “non-regulation” apparatus and therefore have waved off the goal?

USSF answer (March 25, 2011):
This answer repeats what we have replied in three earlier answers and in the USSF publication “Advice to Referees on the Laws of the Game”:

The referee should not have allowed the goal to be used in the first place. An appropriate pregame inspection would have prevented such a thing. Wheeled goals fall under the same category as standard U. S. football goalposts. This is covered in the USSF publication “Advice to Referees on the Laws of the Game”:

(b) Non-regulation appurtenances (see 1.7)
These include superfluous items attached to the goal frame (such as the uprights on combination soccer/football goals) and not generally subject to movement. If the ball contacts these items, it is deemed to be automatically out of play and the restart is in accordance with the Law, based on which team last played the ball.

The intelligent referee will either not permit equipment that is not in accordance with the Law or be prepared to face the problems that occur. Full details should be included in the match report.

This question emphasizes the importance of a thorough pregame inspection. However, if the referee has inspected the field and determined that the goals or other appurtenances meet the requirements of the Law, then he or she cannot later rule that the equipment is no longer acceptable–unless something has happened that changes the state of the equipment. In that case, the wheels are still regarded as unofficial superstructure and if the ball is affected by them, the ball is dead and play stops, with an appropriate restart in accordance with the Law (corner kick or goal kick, depending on who last played the ball for a ball that left the field, and a dropped ball if the ball remained on the field).…

INSIDE THE NET

Question:
Are players who go or fall into the net area considered out of the field?
If I strike or impede someone from coming into the field of play, what action can the referee take?

USSF answer (March 17, 2011):
A player who prevents an opponent who has left the field in the course of play from re-entering the field of play has committed at least misconduct (unsporting behavior), for which he must be cautioned.

If, in the opinion of the referee, any part of the player committing the act is on the field, then the act (foul and/or misconduct) has been committed on the field of play. If the action of the player involves physical contact with the opponent, then the act has been committed on the field of play of any part of either the player or the opponent is on the field. The act has occurred off the field only if no part of the player committing the act is on the field or, where the act involves physical contact, no part of either the player or the opponent is on the field.
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Full details of possible restarts in this situation are included here in this excerpt from the Interpretation of the Laws of the Game and Guidelines for Referees (2010/2011):

Restart of play:
• If the ball is out of play, play is restarted according to the previous decision.
• If the ball is in play and the offense occurred outside the field of play:
– if the player is already off the field of play and commits the offense play is restarted with a dropped ball• from the position in which the ball was located when play was stopped, unless play was stopped inside the goal area, in which case the referee drops the ball on the goal area line parallel to the goal line at the point nearest to where the ball was when play was stopped
– if the player leaves the field of play to commit the offense, play is restarted with an indirect free kick from the position in which the ball was located when play was stopped (see Law 13 — Position of Free Kick)
• If the ball is in play and a player commits an the offense inside the field of play
– against an opponent, play is restarted with a direct free kick from the position where the offense occurred (see Law 13 — Position of Free Kick) or a penalty kick (if inside the offending player’s own penalty area)
//rest deleted as not germane//

PLAY OR GONE, THAT IS THE QUESTION

Question:
A Match is a few mins into the second half when you realize that the teams did not change ends at half time.

I know that you would have to restart the second half again and nullify EVERYTHING AND ANYTHING which happened in the time which was played.

This raises a further question: What would happen if you sent somebody off in this now nullified time?

I say you would have to allow them back on.

This question was asked at a Referees Seminar in [another country[ last year and the organizers were dubious of my answer.

USSF answer (January 26, 2011):

Without having full details of what occurred in the match, and knowing full well that there is nothing in the Laws of the Game to cover this situation, our opinion (and it is no more than an opinion) would be to stop play as quickly as possible, have the teams switch ends of the field, and restart with a dropped ball where the ball was (but with this location determined by the reversed polarity of the field — i. e., if 3 yards past the midfield line into the Blue end of the field, drop the ball 3 yards past the midfield line into the NEW Blue end of the field). Allow all earlier actions to stand, regardless of what they were, and then provide full details and a “ea maxima culpa” in the match report. There is no basis in the Laws to restart the half anew; doing so would imply that the actions occurring since the original start of the second half did not occur and the culprit would thus escape without punishment.…

ADDING TIME

Question:
I was the center referee in [a local] U-11 girls game. . . . Just was looking for your expertise in the matter of applied add-on time. I felt my actions were justified. Many referees do not add on time and to me, ruin the spirit of the game. I understand time constraints in tournaments and multiple games on the same field yet, this was not the case. What is your outlook on upholding add on time?
Thank you!

USSF answer (November 10, 2010):

Unless the local rules of competition specify otherwise (as in some tournaments, which do this counter to the Laws of the Game), there is no set or particular moment to end a game. Law 5 empowers the referee to act as timekeeper and to keep a record of the match. Law 7 instructs the referee to add time (at his discretion) for time lost in either half of a game or in any overtime period for the reasons listed in Law 7 (Allowance for Time Lost). Five minutes added time to U11G may seem a bit much at that level of play, but it can easily be justified.

Referees allow additional time in all periods for all time lost through substitution(s), assessment of injury to players, treatment of injuries on the field , removal of injured players from the field of play for treatment, wasting time, as well as “other causes” that consume time, such as kick-offs, throw-ins, dropped balls, free kicks, and replacement of lost or defective balls. Time must also be added for deliberate delays or other infringements of the Laws at restarts and for disciplinary matters.

Many of the reasons for stoppages in play and thus “lost time” are entirely normal elements of the game. The referee takes this into account in applying discretion regarding the time to be added. The main objective should be to restore playing time to the match which is lost due to excessively prolonged or unusual stoppages. Law 5 tells us that the referee’s decisions regarding facts connected with play are final. The only time lost that is normally not added to a period of play is ball retrieval for goal kicks, corner kicks, or throw-ins, unless they are extended through timewasting tactics by either team.…

SEND OFF — SHORT OR FULL STRENGTH?

Question:
The referee sends a player from the field for illegal equipment, blood, etc. While off the field correcting the situation and before signaled to re-enter by the referee, the player a.) clothes lines a player on the field as the player runs down the touchline with the ball. b.) strikes a player on the bench. c.) uses foul/abusive language towards the referee. The question is whether the team will be playing short from that point on in the match? Several “senior referees” respond that because the player is not on the field, the referee cannot make the team play short handed from the send-off for the misconduct.

USSF answer (August 7, 2010):
The “senior referees” should consider packing it in — or start taking memory pills. A player sent from the field to correct equipment problems (or to receive medical attention) is still a player and counted as being part of the team on the field.

Law 3 (in the Interpretations of the Laws of the Game and Guidelines for Referees) tells us:

Player outside the field of play
If, after leaving the field of play to correct equipment or kit, to be treated for an injury or bleeding, because he has blood on his kit or for any other reason with the referee’s permission, a player re-enters the field of play without the referee’s permission, the referee must:
– stop play (although not immediately if the player does not not interfere with play or if the advantage can be applied)
– caution the player for entering the field of play without permission
– order the player to leave the field of play if necessary (infringement of Law 4)

If the referee stops play, it must be restarted
– with an indirect free kick for the opposing team from the position of the ball when play was stopped (see Law 13 — Position of Free Kick) if there is no other infringement
– in accordance with Law 12 if the player infringes this Law

Scenario (a) only: The referee must punish the more serious of the two simultaneous acts of foul/misconduct and send off the player who was off the field with the referee’s permission for violent conduct or serious foul play (see below). Because this player re-entered the field to clothesline the opponent, Law 12 governs the restart, which will be a direct free kick from the place where the player struck his opponent. This player’s team must play short for the remainder of the game.

In short: In scenario (a), send off for serious foul play if competing for the ball or for violent conduct if not competing for the ball and restart with a direct free kick where the “clothesline” occurred; scenario (b), send off for violent conduct and restart with dropped ball where the ball was when play was stopped; and, in scenario (c), send off for abusive language and restart with a dropped ball where the ball was when play was stopped. In all three scenarios, the team plays down.…

OUTSIDE INTERFERENCE WITH THE REFEREE

At a recent game, an incident occurred and I wanted to get some clarification on what a referee/coach mentor is allowed to do during a game he/she is observing and what other referees who are waiting for their games can verbalize to another referee.  I also wanted to get clarification on Law 12 of the game.

Here is what occurred:

Question:

My team was on an offensive attack and a cross was delivered into the 6 yd box.  One of my players was making a run to the near post to attempt to score a goal.  The goalie came off the line and then fumbled the ball and the ball was loose on the ground in front of the goal.  My offensive player saw an opportunity to finish a play and proceeded to try to score.  The goalie then bent over and to the left to recover the bouncing ball and moved into the path of the oncoming offensive player.  The offensive player attempted to twist away from the goalie that was now in the path.  The goalie grabbed the ball and immediately proceeded to get in the upright position and collided with the oncoming offensive player.  The collision between the two players caused the goalie to go to the ground and the oncoming player was spun around and landed upright facing in the opposite direction.  The referee came and showed the yellow card to the offensive player.

After the initial call, the center referee went to the sidelines where the center proceeded to speak to the AR and another person on the sidelines who was not part of the 4 man crew.  After several minutes of discussion among them, the center showed the red card to the offensive player for a sendoff.

After the game, I asked who the referee spoke to on the sidelines, as it was a person not in referee attire and not part of the 4 man crew.  I was told that it was the referee mentor that the center was speaking to.  Several days after, I found out that it was actually just another referee awaiting a game that was involved in a discussion with the center and the AR.  The other AR and the 4th official were not involved in the discussion.

My first question is this, is the referee mentor or another referee allowed to give input in a game that they are not officiating?  Does the referee mentor have the capacity to give advise in regards to a specific incident during a game and help the center referee determine what call to make?  Can a referee who is not part of the 4 man crew render advice that potentially alters the call of the center referee?

Second, the player was sent off for violent conduct.  In reading the FIFA Law 12 in regards to violent conduct, I highlighted a statement that I felt was misapplied at the time of the send-off.  It clearly states that violent conduct is when an opponent is not challenging for the ball.  In the incident that occurred, the ball was loose and therefore the goalie did not have clear possession of the ball.  The offensive player was challenging for the ball.  The collision resulted due to the fact that the goalie moved into the path of the oncoming player to recover a dropped ball.  In reading Law 12 in regards to the verbage of violent conduct, my player should not have received this send-off.  Am I reading this Law correctly and was it misapplied in regards to this incident?
A player is guilty of violent conduct if he uses excessive force or brutality against an opponent when not challenging for the ball.

Violent conduct may occur either on the field of play or outside its boundaries, whether the ball is in play or not.

He is also guilty of violent conduct if he uses excessive force or brutality against a team-mate, spectator, match official or any other person.

I would appreciate any clarity you can give.

USSF answer (May 25, 2010):
First question:
Mentors (and assessors) are not allowed to interfere with the referee’s management of the game until the game is over. During the game (from the first kick-off until the final whistle), the referee should not consult with or be bothered by anyone other than his or her assistant referees and fourth official, if there is one. No referee, instructor, mentor, assessor, assignor, or administrator who is not assigned as referee or assistant referee or fourth official is allowed to interfere in any way until the game is over. This answer of earlier this month may be of help in that regard:

USSF answer (May 4, 2010):
Unless there is some special rule in your state that does not exist in other states, the mentor (or the assessor) is not allowed to interfere with the referee’s handling of the game until after the game has ended; not at a stoppage, not at halftime. He or she cannot intervene to make the referee change a call or take back a card or anything else. That sort of thing is done in the postgame conference.

However, the mentor (but NOT the assessor) could quietly suggest to the nearer assistant referee that the referee might wish to do this a bit differently — provided that the game has not already been restarted. The AR could then pass this information on to the referee.

Second question:
What is of greater concern to us is your perception of the incident in which your attacker was involved with the opposing goalkeeper. As you describe it, we see your player in the aggressor role, bowling over the goalkeeper who was simply doing her job — protecting her goal. In doing so, your player would seem to have committed serious foul play, not violent conduct, by using excessive force and total disregard for the safety of her opponent, in an attempt to win the ball.

These definitions from the USSF publication “Advice to Referees on the Laws of the Game,” also meant for the reading pleasure of coaches, players, and spectators, may be helpful:

12.33 SERIOUS FOUL PLAY
It is serious foul play when a player uses violence (excessive force; formerly defined as “disproportionate and unnecessary strength”) when challenging for the ball on the field against an opponent. There can be no serious foul play against a teammate, the referee, an assistant referee, a spectator, etc. The use of violence or excessive force against an opponent under any other conditions must be punished as violent conduct.

It is also serious foul play if a player commits any tackle which endangers the safety of an opponent. In this case, the tackle may be from behind, from the side, or from the front.

This does not include serious misconduct by substitutes, who should be punished for violent conduct if they commit an act as described in the first paragraph of this section. (See 12.34.).

12.34 VIOLENT CONDUCT
It is violent conduct when a player (or substitute or substituted player) is guilty of aggression towards an opponent (when they are not contesting for the ball) or towards any other person (a teammate, the referee, an assistant referee, a spectator, etc.). The ball can be in or out of play. The aggression can occur either on or off the field of play.

A player is unlikely to be “contesting for the ball” if the player’s action against the opponent occurs from behind and with the ball on the opposite side of the opponent or with the ball beyond playing distance.

STOP, SUSPEND, ABANDON OR TERMINATE?

Question:
On what grounds can a referee stop and abandon a soccer match

USSF answer (March 31, 2010):
An interesting question, one that requires a good bit of space to answer completely.

Under the Laws of the Game (or, as they are called in Great Britain, the Laws of Association Football), the referee has the power to stop, suspend or abandon the match, at his discretion for any infringements of the Laws or for outside interference of any kind. A referee (or where applicable, an assistant referee or fourth official) is not held liable for a decision to abandon a match for whatever reason.

We need first to differentiate between “abandon” and “terminate” a match. The difference between terminating a match and abandoning a match is a subtle one, but it is historically correct and supported by traditional practice. (Research into the history of the Laws will reveal this clearly; the IFAB now uses “abandon” almost exclusively, most likely just to confuse us all.) The referee may abandon a match if there is an insufficient number of players to meet the requirements of the Law or the competition, if a team does not appear or leaves before completion of the game, or if the field or any of its equipment do not meet the requirements of the Laws or are otherwise unsafe; i. e., for technical (Law 1) or physical (Law 4) safety. An abandoned match is replayed unless the competition rules provide otherwise. The referee may terminate a match for reasons of non-physical safety (bad weather or darkness), for any serious infringement of the Laws, or because of interference by spectators. Only the competition authority, not the referee, has the authority to declare a winner, a forfeit, or a replay of the match in its entirety. The referee must report fully on the events. “Suspended” means that a match was stopped temporarily for any of various reasons. After that the match is either resumed, abandoned, or terminated and the competition rules take over.

CONDITION OF THE FIELD (AND APPURTENANCES)
• Law 1 states that if the crossbar becomes displaced or broken, play is stopped until it has been repaired or replaced in position. If it is not possible to repair the crossbar, the match must be abandoned. In addition, if the referee declares that one spot on the field is not playable, then the entire field must be declared unplayable and the game abandoned.

• A careful inspection of the field before the start of the game might lead the referee to abandon the game before it was started. If, once the match has begun, the referee discovers a problem that is not correctable, then the referee’s decision must be to abandon the game and report the matter to the competition authority.

• Under Law 5, the referee is authorized to stop play if, in his opinion, the floodlights are inadequate.

INTERFERENCE BY PLAYERS, OTHER PARTICIPANTS, OR SPECTATORS
If an object thrown by a spectator hits the referee or one of the assistant referees or a player or team official, the referee may allow the match to continue, suspend play or abandon the match depending on
the severity of the incident. He must, in all cases, report the incident(s) to the appropriate authorities. Using the powers given him by Law 5, the referee may stop, suspend or terminate the match, at his discretion, for any infringements of the Laws or for grave disorder (see below). If he decides to terminate the match, he must provide the appropriate authorities with a match report which includes information on any disciplinary action taken against players, and/or team officials and any other incidents which occurred before, during or after the match. In no event may the referee determine the winner of any match, terminated or not. Nor may the referee decide whether or not a match must be replayed. Both of those decisions are up to the competition authority, i. e., the league, cup, tournament, etc.

“Grave disorder” would be any sort of dustup involving the players and/or spectators and/or team officials which puts the officials in immediate or likely subsequent jeopardy — fights which metastasize beyond just 2 or 3, masses of spectators invading the pitch, throwing dangerous objects (e. g., firecrackers, butane lighters, etc.) onto the field, and so forth.

THE NUMBER OF PLAYERS
• The referee has no authority to force a team to play if they do not wish to continue a game nor to terminate the match in such a case. The referee will simply abandon the game and include all pertinent details in the match report.

• In the opinion of the International F.A. Board, a match should not be considered valid if there are fewer than seven players in either of the teams. If a team with only seven players is penalized by the award of a penalty-kick and as a consequence one of their players is sent off, leaving only six in the team, the game must be abandoned without allowing the penalty-kick to be taken unless the national association has decided otherwise with regard to the minimum number of players.

• The referee must not abandon the game if a team loses a kicker after kicks from the mark begin. The kicks must be completed.

• If a player has been seriously injured and cannot leave the field without risking further injury, the referee must stop the game and have the player removed. If, for whatever reason, there is no competent person available to oversee removal of the seriously injured player from the field for treatment, then the match must be abandoned.

• If player fraud is alleged prior to the game and the player will admit that he is not the person on the pass he has presented and the game has already begun, the referee will have to deal with the matter of an outside agent on the field. If the fraud were not discovered until after the game had been restarted, the only solution would be to abandon the match. If there is no goal issue, the fraudulent player is removed and the game is restarted with a dropped ball.

• If a player, from a team with only seven players, leaves the field of play to receive medical attention, the match will stop until this player has received treatment and returns to the field of play. If he is unable to return, the match is abandoned, unless the member association has decided otherwise with regard to the minimum number of players.

In all cases, the referee must submit a full report to the appropriate authorities.

AMOUNT OF TIME PLAYED
If the referee discovers that a period of play was ended prematurely but a subsequent period of play has started, the match must be abandoned and the full details of the error included in the game report.

TEAM OFFICIALS
The Laws make the point that the coach and other team officials must BEHAVE RESPONSIBLY and thus may not shout, curse, interfere, or otherwise make a nuisance of themselves The coach’s presence, or the presence of any other team official, is generally irrelevant to the game — under the Laws of the Game, but it may have some importance under the rules of youth competitions. If the coach or other team official is removed, known in the Law as “expelled,” that person must leave the field and its environs. If it is a youth game and the coach and all other team officials have been expelled, then the referee should consider abandoning the game. A full report must be filed with the competition authority. The referee has no authority to determine who has won or lost the game, whether by forfeit or any other process; that is the responsibility of the competition authority. The referee must file a report on all events associated with the abandonment.

RESULT OF THE MATCH
Once the game begins, only the referee has the right to decide whether the game continues, is suspended temporarily, terminated or abandoned. If a game is abandoned or terminated before it is completed, the determination of the result is up to the competition authority (league, cup, tournament). In most cases, competitions declare that if a full half has been played, the result stands, but that does not apply to all competitions. The referee does not have the authority to declare what the score is or who has won the game. The referee’s only recourse is to include in his game report full details of what caused the match to be abandoned or terminated. The status of an abandoned is determined by the rules of the competition or the competition authority itself. There is no set amount of time, but many rules of competition will call a game complete if a full half has been played.…

MISSED AR FLAG (AND CORRECTION TO ADVICE 6.4)

Question:
At our USSF recertification class we were instructed that we now have up to six or seven restarts to “take a missed call back” to the original foul. Example given at class – Assistant Referee signals offside on white & center referee does not see nor acknowledge the offside call due to lack of focus. The AR maintains his/her position of offside during which time 1.)a goal kick took place for red, 2.) then a direct kick for white 3.) a throw-in for red 4.) PK for red resulting in a score 5.) ensuing kickoff 6.) ball out of bounds; at which point center referee now notices the AR still at attention for the original offside 6 restarts past. We were told the Referee should honor the call by the AR and award an IFK to the red team for the original offside infraction. I would not want to be the center referee in that game! Then a few weeks later this situation occurred at the college level. While there were only three restarts in between, the referee went back to the original call by the AR. Seems like a powder keg to me.

USSF answer (March 22, 2010):
You are absolutely correct. The Federation has never issued any instruction that ARs keep their flag raised through up to six or seven restarts. The Federation’s guidance has been published in the Advice to Referees on the Laws of the Game. Here is a quote from the 2009/2010 edition:

6.4 MISSED ASSISTANT REFEREE SIGNALS
If the assistant referee signals a ball out of play but the referee does not see the signal for an extended period, during which play is stopped and restarted several times, the assistant referee should lower the flag.  The FIFA Referee Committee has declared that it is impossible for the referee to act on the assistant referee’s signal after so much play.

If the referee misses the assistant referee’s signal for offside, the assistant referee should stand at attention with the flag raised until the defending team gains clear possession or until a goal kick or throw-in is awarded to the defending team.  

Although the general rule is that a card for misconduct must be given at the next stoppage of play and that, if this does not occur, the opportunity to punish the misconduct has passed, the International Board’s “Interpretations” section has stated that this does not apply to serious foul play.  However, in order to make handling such incidents credible, certain conditions must apply.  The most important requirement is that the assistant referee must have signaled the original misconduct and maintained the signal despite it not being seen by the referee.  USSF has indicated that this requirement should be discussed thoroughly in the pre-game and that the referee should clearly indicate what sorts of misconduct would qualify for this treatment.  The International Board spoke specifically of “serious foul play” but USSF guidelines include any form of violence (including “violent conduct”).  If the referee becomes aware of the assistant referee’s signal for misconduct at a subsequent stoppage of play, the restart (after the misconduct is handled) would remain the same based on what stopped play in the first place.  If, upon becoming aware of an assistant referee’s signal for misconduct, play is stopped solely for this reason, the restart is a dropped ball where the ball was when play was most recently stopped*.

To avoid such situations, the referee should make eye contact with the assistant referees as often as possible.  In addition, the assistant referees must be alert for and mirror each other’s signals if needed to assist the referee.

NOTE:The final sentence of the third paragraph of Advice 6.4 has been corrected to match equivalent information in Advice 5.13: The correct restart is a dropped ball, rather than the indirect free kick formerly included there. We apologize for the error, which did not in any way affect the misinformation that raised the original question.…

MAKE A DECISION, REFEREE!

Question:
In the USSF training (at least in my area) for many years now the instruction has been that for out of bounds calls for which the officials do not see/know which team ought to get the possession, a throw in or a goal kick should be awarded to the “defense.”

I assume this has been USSF’s preference all along as well. Given the emphasis today by FIFA and USSF on “scoring” and “offensive play” for soccer should we officials now be awarding throw ins and corner kicks for the “attacking” team rather than the defense when we are uncertain who last touched the ball? (Yes, I know this circumstance should never occur – esp. with 3 officials – but unfortunately it does!)

USSF answer (February 1, 2010):
Although INFORMAL advice for many years was to award the ball to the defending team on any questionable situation where the ball had passed out of play across one of the boundary lines, that WAS NOT and IS NOT the Federation’s formal guidance on a ball passing out of play.

Referees should take care not to use any unofficial option as a means of avoiding a difficult but necessary decision as to which team should have the restart. Nor should the referee use the dropped ball to restart play as a crutch in those cases where there is some question about the correct restart. The referee must make a decision and announce it firmly.

This excerpt from the Advice to Referees 2009/2010 should give referees all the guidance they need:

9.3 SIMULTANEOUS TOUCHES
The referee should promptly signal a clear decision on the direction for the restart when the ball appears to have gone off the field from “simultaneous” touches by members of both teams. Under the Laws of the Game, it is not permissible to give a dropped ball restart in situations where the referee cannot decide which team has possession. The players quickly identify referee indecision, and will use it to their advantage.

To emphasize the point: MAKE A DECISION, REFEREE!…

INJURY TO THE GOALKEEPER

Question:
If a goalkeeper gets hurt and is treated on the field, is he or she required to leave the field, as would another field player be required to? Does it depend on the league, eg. FLUGSA or the age of the keeper, or is there one set rule for everyone?

USSF answer (January 11, 2010):
The goalkeeper is not required to leave the field following treatment unless his or her medical condition requires much more extensive treatment. In that case, the team must either temporarily exchange a current field player for the goalkeeper (who is temporarily off the field) or substitute for him or her.

You will find your guidance in the Interpretations of the Laws of the Game and Guidelines for Referees, under Law 5. Note in particular the “Exceptions” at the bottom of the ruling, but let common sense and the Law prevail.

Injured players
The referee must adhere to the following procedure when dealing with injured players:
* Play is allowed to continue until the ball is out of play if a player is, in the opinion of the referee, only slightly injured
* Play is stopped if, in the opinion of the referee, a player is seriously injured
* After questioning the injured player, the referee may authorize one, or at most two doctors, to enter the field of play to assess the injury and arrange the player’s safe and swift removal from the field of play
* The stretcher-bearers should enter the field of play with a stretcher at the same time as the doctors to allow the player to be removed as quickly as possible
* The referee must ensure an injured player is safely removed from the field of play
* A player is not allowed to receive treatment on the field of play
* Any player bleeding from a wound must leave the field of play. He may not return until the referee is satisfied that the bleeding has stopped. A player is not permitted to wear clothing with blood on it
* As soon as the referee has authorized the doctors to enter the field of play, the player must leave the field of play, either on a stretcher or on foot. If a player does not comply, he must be cautioned for unsporting behavior
* An injured player may only return to the field of play after the match has restarted
* When the ball is in play, an injured player must re-enter the field of play from the touch line. When the ball is out of play, the injured player may re-enter from any of the boundary lines
* Irrespective of whether the ball is in play or not, only the referee is authorized to allow an injured player to re-enter the field of play
* The referee may give permission for an injured player to return to the field of play if an assistant referee or the fourth official verifies that the player is ready
* If play has not otherwise been stopped for another reason, or if an injury suffered by a player is not the result of a breach of the Laws of the Game, the referee must restart play with a dropped ball from the position of the ball when play was stopped, unless play was stopped inside the goal area, in which case the referee drops the ball on the goal area line parallel to the goal line at the point nearest to where the ball was when play was stopped.
* The referee must allow for the full amount of time lost through injury to be played at the end of each period of play
* Once the referee has decided to issue a card to a player who is injured and has to leave the field of play for treatment, the referee must issue the card before the player leaves the field of play

Exceptions to this ruling are to be made only when:
* a goalkeeper is injured
* a goalkeeper and an outfield player have collided and need immediate attention
* a severe injury has occurred, e.g. swallowed tongue, concussion, broken leg.

If you need further guidance, here is a USSF memorandum from 2007 that is still valid:

Subject: Handling Injuries

Date: October 12, 2007

An incident at the first U.S. Soccer Development Academy Fall Showcase tournament led to extensive discussions regarding the correct referee actions to be taken when a goalkeeper and opponent are injured. The lack of a single clear answer among the many experienced observers gathered there is the reason for this position paper.

Injuries pose numerous difficult decisions for the referee. On the one hand, soccer is a game of continuous action in which stoppages are and should be infrequent. On the other hand, player safety is an obvious matter of concern. Since stopping play may be beneficial for one team, an added issue is the possibility of a player simulating an injury or its degree of severity in an effort to gain that benefit. 

Law 5 establishes several basic principles regarding player injuries:
− If, in the opinion of the referee, the injury is serious, play must be stopped.
− If, in the opinion of the referee, the injury is not serious, treatment of the injury is delayed until play is stopped for some other reason.
− If the referee stops play for an injury, the injured player must leave the field and cannot return until play is restarted and the referee gives permission.

The International Football Association Board (IFAB), in its Additional Instructions and Guidelines (AIG) which accompany the Laws of the Game, has clarified certain issues:
− An injured player may not receive treatment on the field unless the injury is “severe” (immediate medical attention is needed).
− An injured goalkeeper is not required to leave the field and may receive treatment while on the field.
− The refusal of an injured player to leave the field despite being required to do so is a cautionable offense (unsporting behavior).
− The removal of an injured player must be swift but safe.
− The referee may signal permission for medical personnel (including stretcher-bearers) to enter the field to assist in the player’s removal from the field (or to provide emergency first aid).

Referees should keep in mind the following additional guidelines regarding the handling of player injuries:
− A player may seek assistance and treatment off the field during play if given permission by the referee to do so (permission is also needed to return to the field, which may occur during play).
− A player who is injured may leave the field for treatment and return to the field before play resumes if the stoppage was not solely for that player’s injury and if medical personnel were not called onto the field by the referee to aid the player’s removal.
− “Medical personnel” for purposes of these guidelines includes any team official who has responsibility for the player in the absence of available trained medical staff.
− If a goalkeeper is seriously injured as a result of a collision with a teammate or opponent and the teammate or opponent is also injured, all players injured in the collision may be treated on the field and are not required to leave the field.
− A player for whom the referee has requested medical personnel to enter the field at a stoppage is required to leave the field and may return with the referee’s permission only after play has resumed even if the stoppage was not expressly for the injury.

Evaluating and balancing these factors must be done quickly and fairly, with appropriate regard for the age and skill of the players.  In all cases of doubt, the safety of the player must be the referee’s primary concern.