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Colby Covington doubts Conor McGregor will follow through with his call-out of UFC welterweight champion Kamaru Usman.

In the hopes of becoming the first UFC fighter to win belts in three weight classes, McGregor has called for a title shot against 170-pound king Usman in his return. Usman has laughed off the call-out and claims he would "murder" the Irishman in a fight.

The Irishman - who is hoping to fight again in the summer or fall - has been sidelined for the good part of a year after breaking his tibia against Dustin Poirier in their UFC 264 trilogy fight. Covington is no stranger to Usman, losing out twice on the welterweight title against the pound-for-pound No.1 'Chaos' thinks McGregor is not suited to the welterweight division despite having competed at the weight class before.

"I think he's probably trying to talk himself up and get himself hyped up, but he's not going to come over here and fight real men," Covington told the ' Full Send Podcast '. "He's a great fighter, he's done good business for himself and he definitely holds a lot of L's over Dustin Poirier, but if you're talking about 170 that's not his weight class.

"I would [fight him] but he's not going to fight someone when he knows there's a zero per cent chance to win. There's no luck factor, he can't even hit lightning in