when can a player be substituted in soccer
Substitute (association football) A player may only be substituted during a stoppage in play and with the permission of the referee. The player to be substituted (outgoing player) must have left the field of play before the substitute (incoming player) may enter the field of play; at that point the substitute becomes a player and the person substituted ceases to be a player. The incoming player may only enter the field at the half-way line. Failure to comply with these provisions may be punished by a caution (yellow card).
Association football A standard adult football match consists of two halves of 45 minutes each. Each half runs continuously, meaning that the clock is not stopped when the ball is out of play. There is usually a 15-minute half-time break between halves. The end of the match is known as full-time.[94] The referee is the official timekeeper for the match, and may make an allowance for time lost through substitutions, injured players requiring attention, or other stoppages. This added time is called additional time in FIFA documents,[95][96] but is most commonly referred to as stoppage time or injury time, while lost time can also be used as a synonym. The duration of stoppage time is at the sole discretion of the referee. Stoppage time does not fully compensate for the time in which the ball is out of play, and a 90-minute game typically involves about an hour of "effective playing time".[97] The referee alone signals the end of the match. In matches where a fourth official is appointed, towards the end of the half the referee signals how many minutes of stoppage time he intends to add. The fourth official then informs the players and spectators by holding up a board showing this number. The signalled stoppage time may be further extended by the referee.[94] Added time was introduced because of an incident which happened in 1891 during a match between Stoke and Aston Villa. Trailing 1–0 and with just two minutes remaining, Stoke were awarded a penalty. Villa's goalkeeper kicked the ball out of the ground, and by the time the ball had been recovered, the 90 minutes had elapsed and the game was over.[98] The same law also states that the duration of either half is extended until the penalty kick to be taken or retaken is completed, thus no game shall end with a penalty to be taken.[99]
Throw-in A throw-in is a method of restarting play in a game of football (or soccer) when the ball has exited the side of the field of play.
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