Manchester United officials are looking at ways to expand the capacity of Old Trafford to 88,000.
The proposed increase of more than 12,000 seats from the present capacity of 75,643 would be achieved by extending the Sir Bobby Charlton Stand, formerly known as the South Stand.
Old Trafford is already the largest club stadium in Britain, but this would almost take it onto a par with Wembley Stadium, which holds 90,000 spectators.
It would also see Old Trafford's capacity overtake the San Siro, Bernabeu, Stade de France and Westfalenstadion on the continent.