The Turin giants have a proud record of boasting Italy's No.1 and have hinted they could move for the teenager once Gianluigi Buffon finally hangs up his gloves
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The 17-year-old is seen as the heir to Gianluigi Buffon's throne in the Italy and Juventus teams, with the keeper a mainstay in Milan's starting XI since making his debut in October last year.
Milan have continually issued hands-off warnings to any potentials suitors but Marotta was again asked about Donnarumma on Monday.
"Juventus have given many players to the national team," Marotta said.
"In the last 20 years, the national team's goalkeeper has always been Juve's: [Dino] Zoff, Buffon... the history of Juventus is made up of Italian champions and talents.
"Donnarumma? We're not thinking about him. We always want to have the best goalkeepers.
"Today we have Buffon, who will play with us for a few more years, and it's beautiful that he represents everything good about football.
"After that, we'll look around and replace him with someone. Of course, it won't be easy to replace a player like Buffon.
"It's a difficult task, but Juventus' ambition is to find a worthy successor."