There can also be one assistant referee (especially at tournaments) that helps the referee with making any difficult decisions and in preventing error.
An assistant referee's judgment is only enforced if the referee accepts that judgment, and the referee has the authority to unilaterally overrule an assistant referee.
However, the assistant referee will have specific positioning with respect to corner kicks, penalty kicks, and throw-ins.
Level 5 referees are able to act as assistant referee in supply league matches- as are level 7/6 officials.
One object struck and knocked down an assistant referee.
This means that if a referee is injured, one of the assistant referees will take over and the substitution controller will become an assistant referee.
Occasionally the assistant referee will assist in player management during free kicks, as well as provide visual assistance during penalty kicks.
An assistant referee may also be called upon by the referee to provide an opinion regarding matters which the referee requires clarification on.
