Juventus' players celebrate with the trophy after winning the Italian Tim Cup (Coppa Italia) final Juventus vs AC Milan at the Olympic stadium on May 9, 2018 in Rome.
Gattuso told Rai Sport: "At this moment Donnarumma is the Milan goalkeeper, the rest is down to the club".
Also like Juve, Milan have lost just one game in their last six. "This defeat stings but we now have to focus on our last two Serie A games.".
Seen as the natural successor to legendary Italian 'keeper Gianluigi Buffon he's earned five worldwide caps to date keeping two clean sheets in the process.More news: Surabaya attacks: 11 killed in Indonesia church bombings
Morocco worldwide Mehdi Benatia broke the deadlock for the hosts 10 minutes into the second stanza with a free header inside the box, 1-0.
But after the interval defender Benatia turned goal scorer heading in off a Miralem Pjanic corner on 56 minutes, for the first goal conceded by Milan in the Italian Cup this season.
Maurizio Sarri's side fell four points behind Juventus who battled past 10-man Inter Milan in a 3-2 San Siro thriller on Saturday night with two late goals in three minutes.
"After my error ... everyone said I was useless".
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