The Serbia defender arrived this week from RB Salzburg.
Ibrahimovic said: "Pavlovic was the perfect player according to our scout team. We followed him for quite a while, in the end we were all convinced.
"He is an aggressive left-footed player, in our defence there was only Theo with the left foot, which we want.
"We need a bit of nastiness and Pavlovic is right for this team. Fonseca likes him a lot, he is young and has a lot of room for growth. He has experience in the Champions League and international football.
"We did everything to get him here. I am 200% sure that he will be one of the fans' favourites. He is someone who enters every duel with his heart, the fans feel it when you give 200% and I say this as a former footballer. Welcome to Milan, Strahinja Pavlovic."