A match is played by two teams each  team consisting of ten outfield players (defenders, midfielders and strikers) and a goal keeper. Substitutes may be used in any match played under the rules of a competition subjected to the authority of the international association or national association. The team is not permitted to use more than two substitutes in any match unless the teams reach an agreement or the referee is informed. The substitute will not enter the field of play until, the player he is replacing has left and then only after having received a signal from the referee. He shall enter the field during a stoppage in the game and at the half-way line. A player who has been replaced shall not take any further part in the game.

Any of the other players may change places with the goal keeper and the referee is informed before the change is made.