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.
Goalkeeper is the only position to be explicitly part of the rules of the game since they were codified in the 19th century.
Unlike the Olympics, FIFA recognizes the four Home Nations of the United Kingdom - England, Scotland, Wales and Northern Ireland- as separate entities.
The African Cup of Nations, the main international football competition in Africa, was first held in 1957.
Mexican goalkeeper Antonio Carbajal played in five consecutive World Cups (1950-66).
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