Donnarumma arrived in the summer from PSG and has already collected a first winner's medal thanks to their Carabao Cup final triumph.
“I think until you live it, you will never understand,” Donnarumma told City's website of working under Guardiola.
“Until you experience him, you can’t understand the importance he has and the effect he has on a team. Sometimes you are shocked, you are enchanted, sometimes to hear him speak, to prepare a game tactically.
“Every situation, the coach helps me. He helps me manage the moments of the game.
“Every game you have some difficulties that maybe in another game you don’t have. And on those situations the coach is very good at preparing for them, at managing them well.
“And I am very happy because he has helped me a lot.
“He has helped me a lot in many situations, on the pitch and off it, and I think both he and the team have been fundamental from the beginning.
“I am very lucky in my career to be coached by him.”