Georges St-Pierre's head trainer, Firas Zahabi, has launched a scathing attack on Conor McGregor by calling him "pathetic" and branding him a "sorry excuse for a human."
The Irish MMA superstar, 31, has been in the midst of controversy after a video showed him punching a drinker in a pub in Dublin.
And Zahabi, who has had a heated rivalry with McGregor in the past, didn't hold back in his brutal criticism of the 'Notorious.'
When he was asked about the UFC star on the latest episode of his 'Ask Me Anything' series, he responded: "I don't care what anybody says, it is indefensible.
"There is no defence to this except that this guy is a pathetic, sorry excuse for a human being. What a disgusting display.
"I don't care how much money you have. I don't care how famous you are in the world. If this is the type of person you are, your value is zero. Your value is zero."
The incident involving McGregor took place in April and is under investigation by Irish police.
But the 'Notorious' has come out to apologise for the incident in a recent interview.
However, Zahabi has slated McGregor by saying that the whole incident is an "embarrassment to MMA, an embarrassment to us all."
He continued: "I'm sure 99 per cent of all Irish people who saw that are disgusted.
"[I'm] $99 sure his coaching staff are disgusted. Everybody's disgusted at this thing.
"He probably thought nobody was filming. We know that when nobody's looking, McGregor will do the most disgusting acts.
"Those are his true colours. It's just purely disgusting. I could not be more disappointed."
Boxing legend Mike Tyson has come out in support of McGregor and insisted that he deserves a second chance.
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Featured Image Credit: PA/Tristar GymTopics: Conor Mcgregor, Notorious, UFC News, MMA News, UFC, MMA, YouTube, GSP, Georges St-Pierre