Rules of the Game: The referee alone is authorized to allow an injured player to re-enter the field, whether the ball is in play or not.
Rules of the Game: During penalty kicks to determine the winner of a match, all players, except the player taking the kick and the two goalkeepers, must remain within the center circle.
Rules of the Game: The center mark of a field is indicated at the midpoint of the halfway line. A circle with a radius of 9.15 m (10 yds) is marked around it.
Rules of the Game: The ball is in play at all other times, including when it rebounds from a goalpost, crossbar or corner flag post and remains in the field of play.
The North American Soccer League (NASL) existed from 1968 to 1984 with teams in the United States and Canada.
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