The home side ended a three-match winless run in style, with the Japan international sealing the points after a fantastic free kick.
Sulley Muntari and Keisuke Honda helped Milan to a 2-0 victory over Chievo at San Siro as the host ended its winless Serie A run.
Having made a flying start to its campaign, Milan's loss to champion Juventus preceded two surprise draws on the road against Empoli and Cesena.
However, Filippo Inzaghi's side got back to winning ways on Saturday with a hard-fought victory over Chievo courtesy of Muntari's second-half volley and a well-struck Honda free kick.
After a first half of few chances, it took Milan just 10 minutes of the second period to move ahead – with Muntari scoring his second goal of the campaign.
The Ghana international struck a volleyed effort from distance into the ground, which looped up and over helpless Chievo goalkeeper Francesco Bardi to end the resistance of the visiting defense.
Eugenio Corini, whose side is without a win since beating Napoli in mid-September, saw any hopes of a draw ended when Japan international Honda fired home 12 minutes from time.
Honda's fourth goal from just six games extended Milan's unbeaten run against the Verona club to 16 contests, while the defense held on for a first clean sheet under former striker Inzaghi.
Jeremy Menez started despite fears over a knee injury and was the hosts main attacking outlet, firing wide from the edge of the area early on before Maxi Lopez saw appeals for a penalty waved away when he tangled with Alex in the hosts' area.
In a game littered with fouls early on, chances were few and far between in a scrappy affair.
The hosts' best chances came following a quick corner that saw Menez thwarted by Bardi before Fernando Torres blazed wide following a goalmouth scramble.
And Menez continued to prove Milan's source of inspiration after the interval, whipping in a dangerous delivery that Honda failed to connect with.
However, the hosts' pressure paid off 10 minutes after the break when Muntari hit a volley from distance and saw his strike into the ground loop over Bardi and in.
Honda would later put the game beyond reach with a dipping free kick that Bardi failed to keep out.