McGregor is currently expected to return to the Octagon at some point before the end of the year, while Masvidal was recently linked to a rematch against a mutual foe in Nate Diaz, and the two UFC rivals have taken things up a notch on Twitter.
It comes after Masvidal carried out a recent interview with MMA Fighting where he claimed McGregor ‘doesn’t want the fight’.
He said: “If he did he’d post something, he’d say something. He’d probably just insult my mom or some relative of mine or my nation where I come from. He’ll say something like that but he won’t say anything about a fight or a fight date.
“So the Conor thing, he just wants it ‘I hope it goes away’ because he really doesn’t want to fight. He doesn’t mention [me] or say anything.
“Obviously it’s maybe the biggest pay-per-view fight in history as far as the UFC goes. I think we’d shatter all numbers, all previous records. But for some reason this guy doesn’t want to entertain it.
“Money doesn’t entertain him no more, make him want to get out of his bed. I think the only thing that makes him want to get out of bed is cocaine. That’s OK, every man has a free will.
“You do whatever you want. But don’t say you’re a fighter and don’t take cheap shots at me, especially the things that he’s been saying, talking about my legal problems and this and that.
“You’re a f****** p****. We could do it man to man in the cage and just once and for all and get paid a handsome reward while doing it. So if this individual doesn’t want to do it, [because] he knows what’s going to happen.”
Unsurprisingly, McGregor wasn’t best pleased with his comments, as it didn’t take long for him to respond on social media.
In a now-deleted tweet, he wrote: “Insult your mum? What a loser you are mate. Me and your mum get along.”
Masvidal replied: “Yeah my mom loves you man. She knows you are about to be the biggest paycheck for me and a relatively easy fight.”