CONOR MCGREGOR is looking lean and mean as he ramps up training for his UFC return.

The MMA superstar underwent a dramatic body transformation during his hiatus from the octagon, putting on several pounds of muscle.

3Conor McGregor hasn’t set foot inside the octagon since breaking his leg two years agoCredit: AP

3The Notorious put on several pounds of muscle during his injury-enforced hiatusCredit: INSTAGRAM@SERGEYPIKULSKIY

3But he seems to have trimmed down ahead of his return to the octagonCredit: INSTAGRAM@THENOTORIOUSMMA

McGregor, 35, beefed thanks to a strict nutrient-dense diet and gruelling upper body workouts as he recovered from the horrific broken leg he suffered two years ago.

But the UFC’s poster boy has drastically trimmed down in preparation for his long-awaited return to the octagon.

The Notorious shared a dressing room selfie of himself to his Instagram story earlier this week.

A topless McGregor looked considerably leaner than he has in recent months and his muscles didn’t look as full.

His oblique muscles even made an appearance as he donned an expensive pair of pyjama bottoms.

Former two-division champion McGregor hasn’t set foot inside the octagon since breaking his leg in his trilogy fight with Dustin Poirier in July 2021.

The Irishman is set to be welcomed back to the cage by former three-time Bellator lightweight champion Michael Chandler – his rival coach on season 31 of The Ultimate Fighter.

The fight was earmarked for December 16, although that date is in doubt as McGregor missed the deadline to re-enroll in the USADA drug testing pool for the required six-month period.

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The UFC can, however, give their poster boy an exemption to the six-month written notice rule.

McGregor has ramped up his training in recent weeks and recently vowed to be back in the cage before year’s end.

When asked to provide an update on his comeback, he told talkSPORT: “December.”

“Chandler next in December and then [Justin] Gaethje, BMF, and then we’ll do the Nate [Diaz] trilogy.”

UFC president Dana White, however, has seemingly poured cold water on Mystic Mac fighting this year.

During an interview with Crain & Company, he said: “To not do that fight will be ridiculous.

“We’re working on it. I’m hoping we can do it early next year.”