It depends on the league. The FIFA Laws of the Game simply say that the number of players is one of the rules that youth leagues can change at their discretion, so different leagues use different numbers of players.
Amount of soccer players.
Each team must field a maximum 11 outfield players at any one time. Each team is also allowed a certain amount of substitutes, although they can only be brought on in...
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you have 2 teams, both teams have 11 players on the field (and some on the bench, but that wasn't your question)
you've got 10 players and 1 goalkeeper.. or 20 players and 2 goalkeepers if you...