Other match officials (two assistant referees, fourth official, two additional assistant referees, reserve assistant referee, video assistant referee (VAR) and at least one assistant VAR (AVAR)) may be appointed to matches. They will assist the referee in controlling the match in accordance with the Laws of the Game but the final decision will always be taken by the referee.
The referee, assistant referees, fourth official, additional assistant referees and reserve assistant referee are the ‘on-field’ match officials.
The VAR and AVAR are the ‘video’ match officials
The match officials operate under the direction of the referee. In the event of undue interference or improper conduct, the referee will relieve them of their duties and make a report to the appropriate authorities.
With the exception of the reserve assistant referee, the ‘on-field’ match officials assist the referee with offences when they have a clearer view than the referee and they must submit a report to the appropriate authorities on any serious misconduct or other incident that occurred out of the view of the referee and the other match officials. They must advise the referee and other match officials of any report being made.
The ‘on-field’ match officials assist the referee with inspecting the field of play, the balls and players’ equipment (including if problems have been resolved) and maintaining records of time, goals, misconduct etc.
Competition rules must state clearly who replaces a match official who is unable to start or continue and any associated changes. In particular, it must be clear whether, if the referee is unable to start or continue, the fourth official or the senior assistant referee or senior additional assistant referee takes over.