Two hours after the mass brawl erupted at the T-Mobile Arena, White explained later that three of the Russian's team were arrested and later released.

"I'm so disappointed," said White. "I'm one of the guys who has worked 18 years to get this sport where it is today."

Mixed martial arts - the UFC - was banned in 36 US states in the mid-nineties and forced underground. White has been part of a small team helping the sport gain recognition in the mainstream.

"The thing was trending to be number one or two of all time on pay-per-view and this is how it ends," he said of the fight league, whose estimated worth is $7 billion. "It's bad for the brand, it's bad for the sport, it's bad for both fight camps. I don't know how anyone can come out looking good from this."

White said the Nevada State Commission, which sanctioned the contest, has withheld 30-year-old Nurmagomedov's purse - $2 million - pending an investigation. McGregor was to be paid his, added White.

The Nevada State governor, who was at the contest, is likely to call for an investigation and the Nevada State Athletic Commission could suspend Nurmagomedov's licence to fight.

White added: "Police officers were getting punched, security guys were getting punched. I actually think police and security did an incredible job. Khabib jumped over the cage like one of those Parkour guys. What are you expected to do?

"What he should have done was walk over, pick Conor up and say some great things to one of other. Whatever you think of Conor, at least respect the guy. I don't like it and don't want to ever be in that position again.

"It's a great sport with great athletes and this is not how we conduct ourselves."

This was a black eye for the sport. On a night when the most eyes in its 25-year history were watching.