[2] English football was initially behind the plans when they were proposed in the early 1990s, in the hope that it would improve teams' stability and prevent agents from searching for deals all year around, but by the time it was eventually introduced they had to be persuaded that it would work.
[3] However, the exact regulations and possible exceptions are established by each competition's governing body rather than by the national football association.
The specific periods depend on the league's season cycle and are determined by the national football authorities.
The periods are different when a league runs throughout a single calendar year, as in most Nordic countries due to weather constraints, Major League Soccer due to both weather and competition from other locally popular sports (notably basketball and American football), or as the traditional season in the Southern Hemisphere.
[34][35] If the last day of a transfer window is on a weekend, the deadline can be extended to the following Monday at the request of those involved for business reasons.
[37][38] The transfer deadline in England was similarly extended to 5 pm 1 September 2009, due to the August Bank Holiday.
[36] A club can request to sign a player on emergency basis, e.g. if several goalkeepers are injured at the same time.
[46] The following year, Wenger hit out at Manchester United's £37m purchase of Juan Mata from rivals Chelsea.
[48][49] Former Crystal Palace manager Alan Pardew questioned why the Premier League transfer window remains open after the start of the season after Arsenal made a bid for midfielder Yohan Cabaye during his time as Newcastle United manager in August 2013.