someone whose name was not given to the referee before the kick-off wants to play?
They cannot take part in the game.
the player being substituted will not leave the pitch?
The game carries on.
a player leaves the pitch at the wrong place to waste time?
The player is shown a yellow card.
the substitute enters the pitch before the player being substituted has left the pitch?
The substitute must go back and wait for the correct time to enter (no card is shown).
a substitution occurs without the referee's permission (except at half-time)?
Both players are shown a yellow card.
a substitution is made during half-time but the referee is not informed?
The substitute may continue to play, no card is shown, and the matter is reported to the appropriate authorities.
a team tries to use too many substitutes?
This must be prevented by the referee.
the referee mistakenly allows too many substitutions to be made?
As soon as this is noticed, it must be corrected and reported to the appropriate authorities after the game.
a substitute or substituted player interferes with the game?
A direct free kick or penalty kick is awarded, and a red or yellow card is shown (see: Red cards and Yellow cards).