The Italy goalkeeper made the move from PSG this summer, joining City as his contract expired.
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While City have been inconsistent this season, Donnarumma insists there's regrets over his choice.
He told Sky Sports: "It was a fantastic 2025, with the Champions League win and joining Manchester City.
"I hope to improve in 2026, achieve great goals, and stay as high as possible with Manchester City.
"These have been very positive six months. There's always room for improvement, but I'm happy with how things are going and how we're improving. A great group has been created."