Alexis Saelemaekers was also on target for Milan while Edin Dzeko, Jordan Veretout and Marash Kumbulla replied for Roma.

Milan have 13 points from five games, two ahead of Napoli and Sassuolo, while Roma have eight.

Milan got off to a flying start with a goal in the second minute. Roma were quickly level as a debutant Milan goalkeeper Ciprian Tatarusanu misjudged a corner and the ball flew over him to the far post where Dzeko outjumped his marker to head in.

Leao also set up Milan’s second goal two minutes after the break when he got away down the left and pulled the back into the area for Saelemaekers to side-foot past Mirante.

Roma levelled again in controversial circumstances in the 71st minute.

Milan also won a contentious penalty eight minutes later when Gianluca Mancini collided with Hakan Calhanoglu and Ibrahimovic calmly scored, leaving Roma to protest.

Roma’s 84th minute equaliser came from another corner and Ibrahimovic was also involved when he stuck out a leg at the near post and deflected the ball into the path of Kumbulla who volleyed in.