The Spaniard was once considered among the finest in the world but his form in the last two years has nosedived and he’s in a struggle with second choice Dean Henderson to be the club’s no.1.
De Gea is currently in Spain after his partner gave birth, meaning Henderson has played and kept clean sheets in the last two matches.
The England international is desperate to be United’s long-term first choice but Sky Sports claim Solskjaer has grand plans to sign a replacement for De Gea this summer.
Oblak, 28, has long been linked with a move to Old Trafford and the Slovenian is a boyhood fan of the Red Devils.
Atletico are league leaders in Spain and would do everything they can to block Oblak’s departure but they could have an instant replacement in De Gea, who is said to be keen on a return to his homeland.
De Gea earns around £375,000-a-week at Old Trafford and United are unlikely to find an outright buyer for the goalkeeper, meaning he’s better used as part of an exchange deal.
The Italian is out of contract at the San Siro at the end of the season and though United are reluctant to deal with Mino Raiola, Donnarumma would make for a cost-effective replacement for De Gea.
Maignan, 25, was considered by Chelsea last summer and the shot-stopper made his debut for France last year following an impressive season in Ligue 1.