Donnarumma was tipped to depart the Rossoneri last year, amid links with La Liga giants Barcelona and Real Madrid, as well as Paris Saint-Germain.
However, the 19-year-old Italy international instead signed a contract extension with the Serie A club, agreeing terms on a new four-year deal in July.
While Raiola - who has made no secret of his difficult relationship with Milan’s CEO Marco Fassone and director of sport Massimiliano Mirabelli - obeyed his client’s wishes in negotiating the terms, he feels Donnarumma should still consider a San Siro exit.
“Gigio made a choice, to stay at AC Milan, and I respect it,” he said in an interview with RAI.
“If he should ask me to leave I would work on it immediately because there are important requests.
“In my opinion, Gigio should leave Milan.”
Donnarumma, who made his first-team debut at the age of 16, declared his happiness at Milan in December after reaching the milestone of 100 appearances for the club.
The talented teenager played a starring role as Gennaro Gattuso’s side reached the Coppa Italia final on Wednesday, saving two penalties in a dramatic 5-4 shootout success over Lazio.
Reports in Italy have linked Napoli’s veteran Spanish goalkeeper Pepe Reina, who is available on a free transfer at the end of the season, with a move to Milan.
