Watch as Ismael Bennacer wins the match with a magnificent volley, but there were also huge chances for Olivier Giroud, Franck Kessie and Leonardo Pavoletti.
Milan consolidated their place at the top of the table with a third consecutive 1-0 victory.
Giroud missed an extraordinary sitter in the opening minutes, while Kessie thumped the upright from distance.
Serie A | Cagliari 0-1 Milan: Bennacer and crossbar decisive in Sardinia
Bennacer was perfectly co-ordinated for his volley from the edge of the box into the far bottom corner.
Pavoletti thought he’d equalised in the final minute, denied by the crossbar, while Alexis Saelemaekers also failed to score one-on-one.