Donnarumma has become Milan's first-choice this campaign, displacing Diego Lopez as the Rossoneri's first-choice custodian.
The teenager has been described as Buffon's successor in the Italy team following his rise to prominence.
And the latter is not only impressed with the 16-year-old's technical skills and physique, but has also hailed his decision making and composure.
"Donnarumma is doing great things as he hasn't shown any fear in taking on a stadium like San Siro, despite playing for a big team like Milan," Buffon told La Gazzetta dello Sport.
"Along with showing great personality, he has great skills technically and physically.
"However, the thing I like most is that we are talking about a youngster who is doing all the right things, which is key in a career.
"The media has also done a good job and they haven't put too much pressure on him. I see measured statements, which is what should be done with such a young player."
Donnarumma has built on his Milan debut in the 2-1 win over Sassuolo back in September by 12 Serie A appearances, keeping four clean sheets in the process.