Patrick Cutrone and a Suso free kick eventually got the better of Cagliari, but Milan found it their most difficult game so far.
The Rossoneri had won all five competitive matches this season between Serie A and Europa League, scoring 13 goals and not conceding any. Jack Bonaventura was injured, with Lucas Biglia and Nikola Kalinic on the bench for the first time, but 19-year-old prodigy Patrick Cutrone retained his place in attack. Cagliari were fresh from a 3-0 defeat to Juventus and had one point at San Siro from 14 visits since a 1-0 win in June 1997.
Cutrone can’t seem to stop scoring at the moment and he broke the deadlock at San Siro, though much of the credit goes to the sensational Suso cross whipped in from the right, as he just had to tap in at the back post. It was his fourth goal of the season in all competition.
Cagliari were unfortunate not to equalise when Marco Sau got the shot away while slipping and it bounced off the base of the near post.
Joao Pedro curled just over the bar and Gigio Donnarumma smothered from a Nicolo’ Barella effort, while Joao Pedro had penalty appeals waved away for Leonardo Bonucci’s nudge.
Fabio Borini went on the counter from a Milan corner and forced a tough save at the near post, but the equaliser had been coming for a while and it was deserved, as Cagliari were dominating the midfield.
Franck Kessie lost the ball in midfield, the impressive Barella rolled across for Diego Farias, who did the same for Joao Pedro to place a low drive past Donnarumma with the Milan defence completely at sea. It was the first goal Milan had conceded in competitive play this season.
Lucas Biglia made his Rossoneri debut, replacing an unusually ineffective Hakan Calhanoglu.
Suso took matters into his own hands, as he earned a free kick just outside the box and curled it into the near top corner with a wonderful finish.
Marco Sau had penalty appeals, but his shot ricocheted off Biglia and on to Bonucci’s torso, while Nikola Kalinic also got his first outing for Milan. Joao Pedro was stretchered off after an accidental knock to the back and Sau tested Donnarumma from distance.
The Sardinians pushed them to the end of nine minutes of injury time and Bonucci needed a desperate block on Sau.