Chelsea stormed to a resounding Champions League victory at the San Siro, where ex-Blues defender Fikayo Tomori was sent off and Reece James suffered an injury.
Tomori’s hand on Mason Mount’s shoulder after 18 minutes put his former team-mate off balance as he shaped to shoot.
That resulted in a penalty being awarded and Tomori being red-carded on a night when nine yellow cards were brandished by referee Daniel Siebert, who seemed overly eager to reach for his pocket.
Jorginho tucked away the spot-kick and Pierre-Emerick Aubameyang doubled the lead 11 minutes before half-time.
Mount, outstanding before being substituted at the interval, set up the second goal with a superb first-time pass, which Raheem Sterling left for Aubameyang to fire home.
The victory took Graham Potter’s side top of Group E and was their fourth win in a row – and third consecutive clean sheet.
It was spoiled only by James going off midway the second half – a blow for Chelsea and a huge concern for England ahead of the World Cup.
James appeared to jar his knee in a challenge with Theo Hernandez. He tried to play on but limped off a couple of minutes later.
Chelsea: Kepa; Koulibaly, Chalobah, Silva; James (Azpilicueta 62), Jorginho, Kovacic, Chilwell (Cucurella 90); Mount (Gallagher 45), Sterling (Loftus-Cheek 62); Aubameyang (Havertz 79).