11 on the field and up to 9 other players on the sidelines who get subbed in (in professional soccer you only get 4 subs).
Major international tournaments, such as the World Cup or the European Championship, feature teams with squads of 23 players. Apart from the 11 players on the pitch, any 3 of the other 12 left on the bench can be used as substitues during the match. Other competitions, such as the Olympic Games, allow for a squad consisting of a maximum of 18 players; again, a maximum of 3 substitutes can be used during a match. Still others allow for a squad of 16 players, with, once again, a maximum of 3 substitutes permitted.
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