The Swede arrived in January and was impressive in the months before the coronavirus suspension.
“He is not a new player for Milan. He is a world star and a very experienced player," Calhanoglu told beIN SPORTS.
“He is our star. He has contributed to us in every respect - with his experience, game ambition, mentality, helping very well out on the pitch.
“Everyone on the outside sees ego. I think there is no ego, he is very approachable, very sympathetic, immediately joking, very enjoyable to spend time with."