By Rhys Turrell, courtesy of The Daily Star

CONOR MCGREGOR’S return to UFC 229 ended in controversy last weekend as rival Khabib Nurmagomedov launched a disgraceful post-fight attack in the crowd.

Khabib forced McGregor to submit in the fourth-round of their lightweight title match at the T-Mobile Arena.

But he then stunned those watching on by launching himself out the cage and laying into McGregor’s pal Dillon Danis in the audience.

Meanwhile two of Khabib's entourage appeared to attack McGregor in the Octagon.

Watching on was McGregor’s opponent at the same venue a little over a year ago - five division world champion Floyd Mayweather.

He thinks a huge fine is heading Khabib’s way after the shocking scenes.

Mayweather believes the financial penalty could even top $1 million.

“I’m not too familiar with the guy McGregor was fighting, but I know the guy he was facing was undefeated,” Mayweather told ITP Live.

“McGregor is a tough competitor but McGregor’s opponent jumped out of the ring and was fighting people in the crowd so… very unprofessional.

“It’s going to be a huge fine I’m pretty sure because with my fight against Zab Judah [in April of 2006], there was a crazy melee in the ring and a huge penalty - a huge fine. If I’m not mistaken, seven figures.

“Not to me, but could have been to Zab Judah or my uncle Roger or even Leonard Ellerbe, so I know when a guy’s jumping out of the cage into the audience and fighting different people, the fine is going to be crazy.”

When asked to explain his post-fight behaviour, Khabib said: “He talk about my religion, he talk about my country, he talk about my father, he come to Brooklyn and he broke bus, he almost killed a couple people – what about this?"

McGregor has been suspended for one month on medical grounds following his UFC 229 defeat to Khabib in Las Vegas.

McGregor's first mixed martial arts contest in almost two years ended when he submitted to UFC lightweight champion Nurmagomedov's rear-naked choke midway through the fourth round.