#3 Gigi Donnarunma (AC Milan)
Donnarumma's form has been patchy in recent seasons. However, this can be traced partly to his transfer issues last season and the porous nature of his teams; Milan and the Italian national team.
This is something that De Gea can definitely relate to. However, Donnarunma remains one of the world's most talented goalkeepers. Agile, fast off his feet with a good command of his penalty area and the ability to make superlative saves look routine, Gigio could be perfect to replace De Gea for Manchester United.
A very experienced goalie who is still to celebrate his 20th birthday, he is one of the few like-for-like goalie transfers Mourinho and the United board could make if their Spanish numero uno decides to take a walk.
United have a great relationship with Donnarumma's agent Mino Raiola. The Italian has brought Zlatan Ibrahimovic, Romelu Lukaku, Henrikh Mkhitaryan and Pogba to Old Trafford since Mourinho arrived in 2016. The Italian international could be the next to join the gravy train.