For any given game, a team can have a maximum of 12 players—7 players, one of whom must be a goalie, and 5 replacements. For the game to begin, a minimum of 5 participants are necessary. Every player must wear the same color jersey (except GK). In soccer, there are 11 players required on the field at all times; if a player is removed through injury or suspension, this number will decrease to 10 players or less. A team can have up to two substitutions per game. Substitutions may be made for any reason during the game except if the team who makes the substitution scores a goal. The rule regarding the number of players on the field was introduced in the 1950s in an attempt to make the game more attractive to viewers. Before this time, there were so many withdrawals from games because of injuries that they could not continue. The idea was to limit the number of players that could be taken off the field without the match being declared void. Although this does prevent players from being removed because of minor injuries, people still find ways to escape from the field without giving the game away! It is possible to start a game with 13 players. If this happens, the referee has the option to postpone the game until it can be restarted with the correct number of players. Alternatively, he can allow the game to proceed with 12 players (or less if applicable).