Jake Paul says he will "expose" Conor McGregor for the "fraud he is" if the two ever meet in the boxing ring.
While Dublin-born McGregor is set to return to the cage this Saturday night in Las Vegas against Dustin Poirier, Paul, 24, remains desperate to get a shot at his older more illustrious rival.
There is no love lost between the pair with Paul consistently firing insults at UFC superstar McGregor.
McGregor, 32, has so far refused to contemplate a fight with the Youtuber and his brother Logan Paul, but this week his stance did change slightly.
Speaking with news.com.au's Nick Walshaw, McGregor was asked about the possibility of the Paul brothers watching his upcoming fight from ringside.
And while he was dismissive of the internet-famous pair, he did leave it open to fight either of the brothers.
"I couldn't care about them two dingbats."
When pushed whether he thought a boxing match could ever happen between himself and one of the Paul brothers, McGregor added: "Never say never. If they're gonna keep competing, who knows?"
McGregor has 'lost it'
Jake Paul though has hit back and after watching McGregor's press conference ahead of the trilogy with American Poirier.
"You can tell Conor has lost 'it'. He no longer speaks from a place of authenticity and you can tell he's trying to convince himself of his own lies. He takes offence to everything now," Paul said.
"He's bathing in his own insecurity. When we fight I will further expose him for the fraud he is."
How much does McGregor want it?
Poirier stopped McGregor in the second round of their fight in January. And according to Planet Sport Boxing editor Joe Hewlett the fight will depend on McGregor's "condition".
"With two defeats in his last three MMA fights, how much does McGregor have left in the tank?" said Hewlett.
The winner will be in line to challenge Charles Oliveira for the lightweight title.
Another loss would put McGregor's elite-level MMA career on the ropes.
Rivalry gets personal
At Thursday's press conference, McGregor said "your wife is your husband" to 32-year-old Poirier.
It failed to ruffle 'The Diamond" who later tweeted a picture of himself and his wife with the following caption.
"Me and the hubby walking into the press conference," he wrote.
It was then Poirer's turn for the trash talk on Twitter, taking aim at McGregor's "thin" hair.
"Your trash talk is as thin as your hair these days! See ya soon champ champ," he said.
McGregor gets his kicks
McGregor has insisted in an ESPN in an interview that he was more focused this time around for his tussle with the Louisiana native.
There was however tension as the pair's staredown in Las Vegas with McGregor trying to kick Poirier.
"I'm coming in to kill this man," he said. "I'm coming in with vicious intent here. Mortar shots. What else can I say? That's the way it is. I'm looking to take this man out cold."