The Premier League have introduced a home-grown player rule which will come into effect from next season, alongside a limit on squad sizes.
From the 2010/11 campaign, the 20 Premier League clubs have voted to introduce measures which will see all teams required to have eight home-grown players out of a squad of 25.
Chief executive Richard Scudamore confirmed the changes, with clubs only able to make alterations to their squads during the two transfer windows.
"As of next season clubs will be required to have a squad named of up to 25 players, of which no more than 17 can be over the age of 21 and not home grown," Scudamore said.
"The definition of home grown is trained for three years under the age of 21 by somebody in the English and Welsh professional system.
"Clubs will have to declare their 25 at the end of August when the window shuts and then again at the end of January."
Players who are aged under 21 are eligible over and above the limit of 25 players per squad