Donnarumma was again impressive for City's Champions League win against Napoli last night.
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Dias said afterwards: "I don't like making comparisons; I felt confident with Ederson too. Obviously, having Gigio behind me is reassuring."
On Kevin de Bruyne's return to City, Dias added: "A club legend and a friend to all of us.
"We've shared some special moments together, and we're happy he's doing well too."