Each of the two teams that play a football match may have a maximum of 11 players counting on the goalkeeper inside the field, of which one will play as goalkeeper, and no less than 7 per team. If this number of players is reached, the match ends, giving the opposite team the winner, with a score of three to zero, although this last number may vary according to the competition.

They have to take into account the additional times, and also each team can have in the bench from 0 to 7 substitutes, according to rules of this sport, at the moment to make a substitution between a titular footballer by an alternate, the team must inform to the autority in the field which is the referee.
More importantly is that, the substitute may not enter to the playing field until the player has been replaced. The substitution is made on the sideline and on half of the field during an interruption of the game.