After this week's apparent breakthrough in the saga to arrange a Floyd Mayweather Jr-Conor McGregor fight, the Irishman has promised to knock out the boxing icon.
Following months of posturing between the pair, UFC president Dana White - who had previously been dismissive of such a showdown - changed his stance on a potential bout and suggested it is inevitable.
McGregor was ringside at The Theater at Madison Square Garden for the professional boxing debut of his friend Michael Conlan and stoked his war of words with Mayweather.
He told reporters: "Watch me take over boxing, trust me on that. No one in this boxing game knows what's coming. Trust me on that. I'm going to step in there and shock the whole goddamn world. Trust me on that.
"Look me in the eyes, 28 years of age, confident as a motherf*****, long, rangy, dangerous with every hand. Trust me, I'm going to stop Floyd and you're all going to eat your words. The whole world is going to eat their words.
McGregor did not provide any information about a date for the potential fight, but said: "Don't worry about it. You'll hear about it. I'm out of here. I am boxing."