When the ball is out of bounds, the defense may only call a timeout during a stoppage of play. Only the offense or team slated to gain possession of the ball can call a timeout if the stoppage occurs within the field of play. A defensive timeout can be used by the opposing team if they believe they can score. The clock should be kept running during a timeout discussion so that it does not affect game time. A defensive timeout can also be called if a player is injured and needs to be replaced. The injury must be serious enough for the player to leave the game; otherwise, he would just stay in. As soon as the player is removed from the game, the coach can let the other team know that he is out with a personal foul or excessive fouling. This will give him a chance to be replaced before the end of the period without affecting the outcome of the game. Only the coach of the team with the ball can call a timeout. He can do this at any time during his own team's turn with no request needed from his players. If he waits too long, however, the opposition will charge down the court and beat them to the spot where the ball was when the timeout was called. The only time a timeout can be requested by your players is if you tell them to during a stoppage of play.