Justin Gaethje said it is "preposterous" if Conor McGregor gets a title shot following his shock loss to Dustin Poirier at UFC 257 as he threatened to quit the octagon.
McGregor was sensationally knocked out in the second round by Poirier in Abu Dhabi, where the Irish star was fighting for the first time in 12 months, while it was just his third appearance in the UFC since the start of 2018.
The former lightweight champion has already called for a third bout against Poirier, who he beat in 2014, and McGregor's coach John Kavanagh wants a rematch to be a title showdown.
But should president Dana White and UFC give McGregor a title contest, American Gaethje (22-3) said he will definitely consider his future.
"For them to come out and say he wants a title shot next, rematch with Poirier, they're f****** i*****," Gaethje, who has not fought since his defeat to unbeaten champion Khabib Nurmagomedov in October, told ESPN.
"He's been treated special over and over and he didn't capitalise on this opportunity. That event was for him, it was for him to win.
"He wants to be Mr. Humble now, but you know he would have been an a****** had he won that fight. I don't feel bad for him, I'm happy for Poirier, I'm happy Poirier went out there did his job, and finished him.
"I love seeing a loudmouth get knocked out, there is nothing that makes me happier. Seeing a piece of s*** get put down, that was great, I loved it.
"He's not fighting for a title. I will think about never fighting in the UFC again if he fights for a title. That would be preposterous. He's sitting at number six, he's won one fight in his entire life in the lightweight division.
"He picks and chooses who he fights. I would love to fight him but I don't think it should be next. But he ain't gonna fight me."