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Conor McGregor has shared a picture of himself back in the gym amid a warning from UFC chief Dana White.

McGregor has not fought in mixed martial arts for 14 months, with his only fight last year a boxing match against Floyd Mayweather.

The Crumlin man is due to defend his lightweight title against Tony Ferguson but has refused to confirm he will compete again.

(Image: thenotoriousmma/Instagram)

But White has warned McGregor that he will be stripped of his belt unless he returns to the Octagon soon.

He told Yahoo : “As long as Conor is willing to fight by March, we could do Khabib [Nurmagomedov] versus Tony and then the winner fights Conor for the title.

“Or, if Conor wants to sit out until next fall, then we’d have to make Khabib versus Tony for the title, not the interim title.”