How many players are on a football team?

These are the main types of football played around the world. There are many variants of each that allow different numbers of players but use the same rulebase or hybrids that are mix-and-match combinations of rules from more than one code. Teams may have up to 53 players on roster, of which 45 may play in each game. There can be 11 on the field at one time. There is no limit on substitutions. Teams may have up to 18 players, of which 11 can be on the field at one time. Only three substitutes may be used per game. There are 22 players on a team, of which 18 may be on the field at any time. There is no limit on substitutions. There may be up to 30 players on a team, only 15 of which may take the field at any time. Only 5 substitutes can be made per game. There may be up to 17 players in a team, of which 13 may be on the field. There is no limit on substitutions. There are 22 players on a team, of which 15 may be on the field at any time.