“There's something crazy about all this. Or maybe something happened we don't know about, and then okay, it's their business, their business alone," he told La Gazzetta dello Sport. "Otherwise, it's crazy, something that has no logical explanation."
Abbiati said Donnarumma was more than half responsible for their Champions League success, adding: "In Europe he made senseless saves, saves that few would have been capable of making.
"So, we can say that there are many better players with their feet than him, but from there to replacing a goalkeeper who has put a Champions League title in your trophy cabinet.
"[Out of 10 I'd give him] an 11 between the posts and a 6.5 with his feet. Still, a full pass."