Law 6 Assistant Referees Explained: What Do They Do?

Law 6 is the section of football's Laws of the Game that defines what assistant referees do. The two flagged officials on the touchline are not there to decorate the pitch; they are the referee's additional check on offsides, throw-ins, corners and fouls in the referee's blind spots. In the Premier League, the easiest place to see Law 6 in action is during substitutions, because that is where the assistant referees, the fourth official and the league's own match rules meet.

How it works

Assistant referees work underneath the referee's authority. Law 6 gives them a specific set of jobs: signal when the ball has left the pitch, indicate which team gets the throw-in, corner or goal kick, and flag an offside offence when a player in an offside position becomes active. They also spot fouls that the referee cannot see, especially when the ball is moving quickly and the referee is following the play rather than a scuffle behind it. None of those signals is a verdict. The referee is the only match official who can stop play, award a free kick or book a player. The assistant's flag is a communication tool, not a decision tool.

The design matters. Because the assistant's view is usually closer to the line and more square to the offside line, Law 6 trusts that view while keeping the final authority with the referee. That is why an assistant will sometimes stand still with the flag down when a goal is scored, even if the attacking team appears to have an advantage. The assistant is waiting to see whether the referee needs a signal. It is the same reason a striker is allowed to keep playing after an offside-looking pass if the assistant does not raise the flag and the referee lets play run. The flag is the beginning of a conversation, not the end of one.

Key details

The Premier League's structure makes Law 6 visible almost everywhere. Twenty clubs play 38 matches each, one home and one away, to complete a 380-match season. Every one of those matches needs a referee, two assistant referees and a fourth official. The same 380-match calendar also carries the points system: three points for a win and one for a draw, with the bottom three clubs relegated to the Championship and three clubs promoted. Two of those promoted places go automatically and one comes through the play-off. Assistant referees do not directly decide promotion and relegation, but their offside and ball-in-play decisions sit on top of a ladder where every point matters.

The most concrete Law 6 detail in the modern Premier League is substitution management. Managers can use five substitutions per match, but only in a maximum of three windows plus half-time. Assistant referees are part of making sure that process is not turned into a delay. They stand near the halfway line, check which player is leaving, and release the replacement when the referee is ready. The fourth official holds up the board, but the assistants are the ones who keep the change coordinated with the offside line and the restart.

Another detail often misunderstood: the offside system is a match-official system, not a Premier League administration system. Law 6 is about what happens on the pitch. The league's squad-list rule, by contrast, is a pre-match rule. The squad list contains 25 players over 21, and at least 8 of those 25 must be homegrown, meaning trained in England or Wales for three years before turning 21. Under-21 players do not count against the 25. Assistant referees do not enforce that rule; the club administration does. Similarly, the European qualification places are a league competition rule, not a Law 6 rule. The top four go to the Champions League league phase, fifth and the FA Cup winner go to the Europa League, and the League Cup winner goes to the Conference League play-off. Cup winners who have already qualified through the league pass the European place down. That is the context for understanding why one assistant-referee decision can change a season.

Common confusions

The first confusion is between assistant referees and the fourth official. The two assistant referees run the touchlines and are the ones with flags. The fourth official is the extra official who stands on the touchline between the two technical areas. For most fans, the fourth official is the person holding up the substitution board and managing the managers. Law 6 groups these roles together as other match officials, but their jobs are distinct. If you see a flag, it is an assistant referee. If you see a board, it is the fourth official.

The second confusion is about offside. Assistant referees are famous for raising the flag late, and some viewers think that means they are being checked by a video review. In practice, the assistant's offside signal is a call that has to survive the referee's reading of the moment. The flag can be lowered, overruled or ignored if the referee decides the attacking player was not involved. The flag is not a camera review; it is a real-time judgment made by someone whose angle is better than the referee's.

The third confusion is about the word assist. Newer Fantasy Premier League managers sometimes hear assistant and reach for the assist points. The two are unrelated. In FPL, an assist is worth 3 points and is credited to the player who makes the final pass before a goal. Assistant referees do not exist inside FPL; they have no points value and no clean sheet category.

The search term law 6 also creates a counting problem. Law 6 is the sixth law in the Laws of the Game, not a rule about six of anything. The Premier League's substitution rule allows five changes per team, in a maximum of three windows plus half-time. There is no sixth substitution bonus. If a manager has used all five changes, an assistant referee will not allow a further change simply because a player has already been substituted; the game continues with what is left on the pitch.

Key takeaways

• Law 6 gives assistant referees a support role, but the referee keeps the final call on every decision.
• A Premier League season is 380 matches because 20 clubs each play 38 matches.
• Teams can make five substitutions in a maximum of three windows plus half-time.
• An offside flag is a signal, not a verdict; the referee decides.
• FPL assists are worth 3 points, but assistant referees are not FPL assets.

FAQ

What is Law 6 in football?

Law 6 is the rule that covers the other match officials, including assistant referees. It explains the jobs they do and makes clear that the referee keeps final authority.

How many substitutions are allowed in the Premier League?

Five per team, made in a maximum of three windows plus half-time. Assistant referees help coordinate the change, but they do not hand out extra substitutions.

Does an assistant referee decide offside?

No. An assistant raises the flag, but the referee makes the final decision. The flag is a signal, not a verdict.

Are assistant referees worth points in FPL?

No. FPL awards 3 points for an assist, 6 for a goalkeeper or defender goal, 5 for a midfielder goal and 4 for a forward goal, but assistant referees are not part of the scoring system.