Arsenal and City enter race for Muslera
The 23-year-old shot-stopper has made 24 Serie A appearances for the Biancocelesti since arriving from Montevideo Wanderers in his native Uruguay in 2007.
The 6ft 3in glove-man, who has been called up by his national team but yet to earn his first cap, has already linked with a move to Old Trafford next summer.
However, according to Tuttomercatoweb.com, the Premier League champions will face competition for the starlet's signature from rivals Arsenal and Manchester City.
The Gunners have recently been forced into fielding 21-year-old Italian Vito Mannone following injuries to Manuel Almunia and Lukasz Fabianski.
While United are also believed to be eyeing up moves for Russian international Igor Akinfeev and Schalke custodian Manuel Neuer as possible replacements for 38-year-old Dutchman Edwin van der Sar.