In professional association football (soccer), a “transfer window” refers to a designated period during a playing season when teams can engage in player transfer deals. Under rules set by the Union of European Football Associations from the 2002–03 season onward, eligible transfer deals can be made only during the summer window, which usually lasts from the end of a playing season in May until the end of August, and the winter window, which lasts through the calendar month of January.
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