a team has fewer than 11 players before the game starts?
Any player arriving after kick-off may play, as long as their name was on the team list given to the referee before the game.
a team is reduced to fewer than seven players during the game (e.g. because of red cards and/or injuries)?
The game must be abandoned and a report to the appropriate authorities must be submitted after the game.
a team has too many players on the pitch?
The referee must stop the game, reduce the team to the correct number and submit a report after the game to the appropriate authorities.
a team has too many players on the pitch and scores a goal?
The extra player must be removed from the pitch and:
See also: ‘Substitutes or team officials on the pitch’
a player changes places with the goalkeeper without the referee's permission (except at half-time or the break before the start of extra time or penalties)?