It was his second goal that showed Leao can make the difference with his individual quality. Receiving the ball about 25 yards out, he shifted the ball past two defenders and with a burst of pace left his marker for dead with some close dribbling.
He then picked his spot, slotting past Handanovic from a tight angle to make it 3-1 on the hour-mark, sparking wild celebrations in the Milan end.
Edin Dzeko got a goal back for Inter but it was too little, too late as Milan secured the bragging rights until the return fixture later this season.
As Chelsea’s attackers struggled again in the Premier League, with Pulisic failing to score after starting in the 2-1 win over West Ham, Tuchel may regret not pushing harder for Leao when the club had the chance to sign him.