Manchester United have been backed to sign Donnarumma after a stellar campaign with AC Milan.
The 18-year-old is an option for Jose Mourinho in case current goalkeeper David De Gea joins Real Madrid.
De Gea came close to signing for the La Liga champions two years ago, only for a faulty fax machine to ensure he stayed at Old Trafford.
However, Real are circling again with Zinedine Zidane desperate to succeed where his predecessor Rafa Benitez failed.
United could lose two goalkeepers this summer with reports suggesting Sergio Romero is a target for Inter Milan.
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AC Milan have ordered Mino Raiola to sort out Gianluigi Donnarumma's future
As a result, Mourinho could intensify his efforts to snap up Milan's rising star.
The fact the player is represented by Mino Raiola could prove key, with the super-agent brokering deals that saw Paul Pogba, Zlatan Ibrahimovic and Henrikh Mkhitaryan join United last summer.
And AC Milan's CEO Marco Fassone has admitted the player's future is uncertain – and has ordered Raiola to sort out where Donnarumma will be playing next season as soon as possible.
“We want to know from Raiola, whether we have a goalkeeper or not for next season," he told Premium Sport.
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AC Milan have admitted they need clarity on Gianluigi Donnarumma's future amid Man Utd interest
David De Gea and Sergio Romero could both leave Manchester United this summer
“As you can imagine, no club would have a goalkeeper like Donnarumma in the stands, but we cannot have a goalkeeper at Milan with a contract that is about to expire.
“We need to have a plan B if things don’t go in the direction we hoped.
“I am convinced that our offer and plans for him are good, but if the answer is negative for any reason, we will activate plan B.”
Donnarumma's current deal expires next summer.
And as well as United, Manchester City and Real Madrid have both been touted as potential destinations.