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'The Notorious' is set to fight rival Dustin Poirier in a trilogy bout at UFC 264 on July 10, but has his eyes on the welterweight division.
Colby Covington is currently the top contender for Usman's title and has brushed off McGregor as a serious challenger.
"I haven't seen it, but I've heard about it and that's obviously just Conor trying to get some hype, get some headlines," Covington told MMA Fighting per Daily Mail.
"Come on, dude, the guy just got knocked out by 'Dustin Sorry-ier.' Come on, are you serious? You want a title shot at 170?
"You're getting beat up by gatekeeper lightweights and now you want to come to the top of the 170 welterweight division.
"Everybody knows what Conor's doing. He's not really gonna do that. He's not gonna come up and fight welterweight.
"He's just doing that to grab attention, to grab headlines, make people think he's being taken seriously because honestly, he's a joke."
Covington then continued by calling the 32-year-old 'washed up'.
"He's the laughing stock in the MMA community and even to casual fans because they're just like, 'Conor's washed up. He's done.'
"He made all that money with his whiskey, he made all that money for the [Floyd] Mayweather fight, he has no motivation.
"Nothing gets him up early in the morning to go fight. He tries to say it's for his kids but man, the guy's done. He has nothing left in the tank."
'Chaos' was then asked for his prediction for McGregor vs Poirier III - backing Poirier to get the job done once again.
"Yeah, and that's not saying like Dustin Sorry-ier is any good or like, is anything special.
"Because the guy's not. The guy's a gatekeeper at lightweight. He's nothing more. All in the big fights he always gets knocked out and beaten. He's a jobber, that's the definition of what Dustin Sorry-ier is."
'The Nigerian Nightmare' ended a recent back and forth with: "I offered you the fight and you went missing. Let's stay humble young man. I already took your pride. Don't make me take your whiskey too."