Paulie Malignaggi: I'll knock Conor McGregor's beard off

No chance McGregor-Mayweather fight (2:00)

Even though Conor McGregor has been issued a boxing license in California, ESPN's Dan Rafael says there is no chance that there will be a fight between Conor McGregor and Floyd Mayweather. (2:00)

Conor McGregor has been told to stick to MMA by former two-weight boxing world champion Paulie Malignaggi.

The Irishman already has expressed interest in luring the undefeated Floyd Mayweather out of retirement -- and even demanded $100 million for it -- with speculation over a superfight growing after McGregor obtained a boxing license in California Wednesday.

"I have been hearing a lot about this Conor McGregor situation and I got to thinking -- you know what? -- I am kind of interested," Malignaggi said in a video posted on his Twitter account.

"At first I was telling Conor to stay in his lane and I was thinking you are going to embarrass yourself, but if you are really going to disrespect the sport of boxing like that then I would like to be the one to teach you that lesson."

McGregor, who is expected to take some time away from the Octagon with his girlfriend expecting their first child in May, made history at UFC 205 in New York last month by becoming the first fighter to simultaneously hold title belts in two weight divisions.

However, the UFC last week stripped him of his featherweight title, which he had not defended in 11 months. With Interim champion Jose Aldo moved up, McGregor finally broke his silence Friday by denying he had relinquished the belt and saying that "someone's got to come take that off me."

Though McGregor is still under contract, his agent Audie Attar previously told ESPN's Five Rounds podcast the 28-year-old's camp would be "very interested" in a Mayweather fight "if it is serious."

"I would never disrespect your sport and tell everybody I could beat the best fighter in the cage," continued Malignaggi, the former IBF junior welterweight and WBA welterweight champion. "You shouldn't come to our sport and tell everybody you could beat the best fighter in our sport in a ring.

"I know you apologize about absolutely f------ nothing, but after I am done with you -- I am going to knock the beard off you homie -- you are going to be apologizing for everything you have been trying to do to get in the boxing ring."

However, McGregor responded in typical fashion when the New York native's comments were put to him at a Q & A event in Northern Ireland.

"Who the f--- is that guy?" he said, recalling his famous put down of Jeremy Stephens from the UFC 205 press conference in September. "I don't know who the f--- that is but I'll slap the nose off him if he ever mentions my name again."

McGregor also continued to stoke the flames for a showdown for Mayweather.

"If I focus, with the work ethic that I have, solely on the sport of boxing then there's no telling what I could do," he said. "I would not go in there just to show up, I'd go in there to knock him [Mayweather] out and that's it.

"He can be hit, he's been hit before. Age waits for no man so I know they know that. I know the size is on my side, I know the reach is on my side and I know the youth is on my side.

"There's a lot to lose for them, so that's why their scrambling and saying 'McGregor's got the boxing license, Floyd's in the Bahamas and he doesn't give a f---.' They're scrambling right now."