It was an ill-tempered affair dominated by the Sulley Muntari goal that was not awarded to Milan in the first half despite it crossing the line.
"The fact Muntari's goal was not seen by the linesman is a tragedy for football," commented Ibrahimovic while on international duty with Sweden.
"I was more disappointed than angry after the game. Everyone could see it was a goal, so not to give it in that situation...
"You can make a mistake with an offside, but not for a goal like that."