Teenager Jan-Carlo Simic announced himself with a goal on his Serie A debut as AC Milan eased to victory over Monza.

The 18-year-old, a first-half replacement for the injured Tomasso Pobega, scored from close range after Tijjani Reijnders had given the home side a third-minute lead at San Siro on Sunday.

Fellow substitute Noah Okafor rounded off a slick team move late on to cement a 3-0 win four days after Milan had come from behind at Newcastle to secure a Europa League berth.

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Victory, just a third in eight attempts in the league, will have come as a relief to under-pressure head coach Stefano Pioli, whose side are now five points adrift of second-placed Juventus in the table, but as many clear of Napoli in fourth.

Buoyed by their success on Tyneside in midweek, the Rossoneri set off in determined fashion and had already seen Olivier Giroud head wastefully over when they took a third-minute lead.

Netherlands international Reijnders took matters into his own hands as he surged through three challenges and into the penalty area before shooting through keeper Michele Di Gregorio’s legs.

Di Gregorio then had to get down well to keep out Theo Hernandez’s eighth-minute strike after Rafael Leao had made good ground down the left.

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The visitors responded and on-loan Milan man Lorenzo Colombo fired into the sidenetting on the turn with Roberto Gagliardini perhaps better-placed, but Ruben Loftus-Cheek saw a deflected attempt loop just over Di Gregorio’s crossbar before the keeper palmed away Alessandro Florenzi’s long-range effort.

It took a fine save by Di Gregorio to keep out Florenzi’s 40th-minute drive, but he was beaten seconds later when substitute Simic applied the finishing touch after Leao had turned smartly away from Matteo Pessina and crossed, before the crossbar denied Christian Pulisic an eye-catching third.

Leao returned seemingly intent on enjoying himself as he embarked upon a series of enterprising runs deep into enemy territory, but it was Simic who went close when he headed wide from a 53rd-minute corner.

Substitute Patrick Ciurria sent a long-range shot over Mike Maignan’s crossbar, but the France international had to make a solid save to keep out Andrea Colpani’s strike.

However, the home side increased their lead in style with 13 minutes remaining when Giroud produced a sublime lay-off from Reijnders’ pass to set up Okafor to score.

Giroud might have got his name on the scoresheet at the end but he failed to make the most of a pacy counter-attack as the visitors were spared further punishment.

AC Milan head coach Stefano Pioli will do his best to make amends for their disheartening Champions League exit by guiding the Rossoneri back into the competition through Serie A once again.

Milan are keen to get over the disappointment of their failure to progress to the knockout stages – Wednesday’s victory at Newcastle was only enough to secure third in their group and Europa League football – with a home win against Monza that will help them maintain their pursuit of second-placed Juventus, currently eight points clear.

Back-to-back league successes against Fiorentina and Frosinone were followed by a frustrating last-minute defeat at Atalanta last weekend and Pioli wants a response to both setbacks in Sunday’s lunchtime kick-off.

Pioli said at a press conference: “My big regret is that the team are not making the most of their potential right now, in Europe and in the league, so that’s what I must work on trying to change.

“This squad has so much potential, we created so many chances especially in the Champions League and lacked that bit of determination and quality. With that, we would have been here celebrating Champions League progress.

“Clearly, we can only now try to consolidate third place in Serie A and then try to do more. Our minimum objective is to qualify for the Champions League again, that is the very least we can aim for.”

Davide Calabria is suspended for the Monza clash after his dismissal in Bergamo so Theo Hernandez will be captain as Pioli tries to reckon with a defensive crisis.

Pierre Kalulu, Mattia Caldara, Marco Pellegrino and Malick Thiaw are all out injured, along with goalkeeper Marco Sportiello, and only one of academy product Jan-Carlo Simic and Simon Kjaer is likely to be fit enough to slot into the backline.

For Monza, Argentinian midfielder Alejandro Gomez is only two months into a two-year doping ban, with on-loan Torino defender Armando Izzo and Hellas Verona loan forward Gianluca Caprari among the key injury absentees.

Sunday’s visitors snapped a poor run of three games without a win by beating Genoa 1-0 last time out but away wins have been hard to come by so far for the mid-table side from the Stadio Brianteo.

Monza boss Raffaele Palladino said at his Saturday press conference: “We are satisfied so far but must keep our feet on the ground and improve on many aspects, such as being more effective in front of goal.

“Playing at San Siro is a source of pride. I believe Monza can do well and put Milan in difficulty. We are set up for this, to compete with anyone, anywhere. We must not be afraid of anybody.”