Transfer window rules -- Squad lists, homegrown players and more
The Premier League has strict rules about the number and type of players that its teams can submit as part of their official squad list for the upcoming season.
Once the deadline closes on September 1, clubs will submit a 25-player squad list. From that number, a minimum of eight players must meet the league's 'home grown player' criteria.
A player qualifies as home grown if they have been registered with an English of Welsh club for three full seasons before their 21st birthday.
Under-21 players at any Premier League club do not need to be registered in the 25-man squad and can play at any time in the season for their team.