Khabib Nurmagomedov has said he believes Conor McGregor should be behind bars after footage emerged of him striking a man in a Dublin bar.
Nurmagomedov, who beat McGregor via submission when the two men met at UFC 229 in October, gave his thoughts to TMZ on the video released on Thursday:
"These people, they have to go to jail. I told you, this guy have no class. No respect.
"This is very bad for sport. Some things he doing good for sport, but right now he without his mind. He lose his mind. It's crazy.
"Government have to smash him. This is my opinion. 'Cause I'm really, really mad about this video. I don't understand how you can punch old man."
TMZ shared the video of McGregor punching a man sat at the bar on its YouTube channel:
TMZ reported McGregor was unhappy with the man at the bar after he refused a measure of the fighter's Proper Twelve whiskey.
McGregor could then be seen hitting the man with his left hand before being pulled away from the bar.
Nurmagomedov and McGregor share a spiky past, with the buildup to their fight accompanied by a war of words.
The edge between the pair was sharpened by McGregor's conduct ahead of UFC 223, when he trashed a bus that had Nurmagomedov and members of his team on board. The Irishman was arrested in the aftermath and pleaded no-contest to a charge of disorderly conduct.
Both fighters were issued with bans after they and their respective camps were involved in a brawl inside the Octagon following the fight.
McGregor hasn't been in action since that loss, and there's been little indication as to who he will face next.
By contrast, Nurmagomedov will put his UFC lightweight title on the line against Dustin Poirier at UFC 242 on September 7.