Luka Jovic opened his AC Milan account as the Rossoneri eased past Frosinone 3-1 at the San Siro.
Christian Pulisic also scored a superb individual effort and Fikayo Tomori put the seal on a comfortable victory before Marco Brescianini’s late consolation for the visitors.
Just one win in five Serie A matches had seen Milan drop off the title pace and Stefano Pioli’s side knew there was no room for error following Juventus’ last-gasp win at Monza on Friday.
Milan were without the likes of Malick Thiaw, Rafael Leao and Olivier Giroud, and full-back Theo Hernandez lined up in the middle of a badly depleted home defence.
A largely uninspiring first half was lit up by Jovic lashing home a superb left-footed volley two minutes before the break.
It was the Serbia striker’s first goal in 10 appearances since joining Milan from Fiorentina in September.
Frosinone, beaten 2-0 at the San Siro by Inter last month, started brightly but Milan had the first opportunity when Yunus Musah’s centre took a wicked deflection and Stefano Turati had to react sharply at his near post.
Milan slowly built up a head of steam and Alessandro Florenzi fired wide, while Samuel Chukwueze’s powerful drive was deflected to safety.
Frosinone full-back Anthony Oyono broke forward but his 25-yard effort went wide as his wait for a first senior goal continued.
The visitors should have taken the lead three minutes before the break after Marvin Cuni dispossessed Tomori.
Cuni had a clear run on goal but the Albania striker lacked conviction and Milan goalkeeper Mike Maignan stood tall to save.
Frosinone were punished for their profligacy within 60 seconds as Simone Romagnoli’s poor pass was picked off by Pulisic, who spotted the unmarked Ruben Loftus-Cheek to his right.
Loftus-Cheek found Chukwueze quickly and, although Romagnoli got his head on the cross, Jovic was waiting to volley in from eight yards.
Milan doubled their lead five minutes after the interval in route-one style.
Maignan’s long punt was brilliantly brought down by Pulisic, who cut across three defenders to present himself with a shooting opportunity.
Turati rushed out to narrow the angle but the American showed great composure to lift the ball over him for his fifth goal of the season.
Tomori added a third after 74 minutes from a well-worked corner routine, the England defender latching on to Jovic’s far-post header to force home his second goal of the season from close range.
Frosinone gained some reward for their determination to keep going eight minutes from time.
Brescianini’s wide free-kick escaped everyone in a crowded penalty area and surprised Maignan, who had no chance of preserving his clean sheet.