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Association football clubs around the world sometimes retire squad numbers to recognise players' loyal service, sometimes as a memorial after their death. ==Background== This practice, long established in the major North American sports, is a recent development in football since squad numbers for specific players were not widely used until the 1990s. Before then, it was typical for players in the starting lineup to be issued numbers 1 to 11 by formation/position on a match-by-match basis, and substitutes to be numbered from 12 upwards, meaning a player might wear different numbers during the season if they were to play in different positions for tactical reasons, or simply not be a regular in the starting lineup. Retiring a player's number usually occurs after the player has left the team or retired. It honours a player who has meant so much to his club that they retire the shirt number that the player wore during their time there, meaning no other player is permitted to use that number in the future. In some cases, such as those of Jason Mayélé, Vittorio Mero, Marc-Vivien Foé, Miklós Fehér, Ray Jones, Dylan Tombides, François Sterchele, David di Tommaso, Antonio Puerta, Besian Idrizaj, and Piermario Morosini, numbers have been retired to posthumously honour a player who died while still active. Also, Norwegian club Fredrikstad retired Dagfinn Enerly's number following an on-pitch accident that left him paralysed. In Britain, only Bobby Moore's shirt number has been retired due to great service to the club as opposed to a tragic incident. Although it has not been officially retired, Gianfranco Zola's No. 25 shirt has not been reissued by Chelsea since he left the club in 2003. The Argentina and Cameroon national teams have been prevented from retiring the numbers of Diego Maradona (10) and Marc-Vivien Foé (17), respectively, by FIFA rules dealing with squad numbers for Finals tournaments; in other competitions or friendlies, national associations may assign numbers according to criteria of their choosing. Similarly, several clubs have been required to reissue retired numbers for continental club competitions due to squad numbering rules of continental confederations. For example, CAF and CONMEBOL have such rules in their club competitions, but CONCACAF does not. Some South American teams (such as Universitario de Deportes or Flamengo, and even Mexican teams invited for the occasions) have occasionally had to re-issue their retired numbers for special cases due to CONMEBOL rules, which state that shirts must be numbered 1–25 in continental club competitions (such as Copa Libertadores and Copa Sudamericana, among others). 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「List of retired numbers in association football」の詳細全文を読む スポンサード リンク
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