Floyd Mayweather Jr throws a punch at Conor McGregor during their super welterweight boxing match last year.

Floyd Mayweather has been throwing out hints he could take up MMA, but former UFC champion Michael Bisping thinks Conor McGregor would "destroy" him in the octagon.

Mayweather, 40, has been fuelling speculation he may move to mixed martial arts. He has been retired from fighting since beating UFC icon McGregor via TKO in the boxing ring in August.

​Last week he released a video clip of himself saying: "2018. Floyd Money Mayweather. MMA. What are the odds? Paddy. What are the odds?"

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The tagline read: "Come at the king, you best not miss ..."

McGregor replied, tweeting: Hahahaha very good. Keep up the good work my son. Yours sincerely, Senior."

ETHAN MILLER/GETTY IMAGES Floyd Mayweather and Conor McGregor party up after Mayweather's 10th round TKO victory in August.

But Bisping can't see a rematch in the cage, suggesting Mayweather would need years to learn the craft of MMA and McGregor's kicking game would be too much for him, The Sun reported.

"I think he's probably trolling people," Bisping said on his podcast Believe You Me.

"I honestly can't see Floyd Mayweather fighting mixed martial arts and certainly [not] in the UFC.

"If he does fight in the UFC it's going to be against Conor McGregor.

"Conor McGregor in an MMA fight will f****** destroy Floyd Mayweather like he's never seen.

"I don't know what he's doing, he's maybe trying to stay relevant, maybe he's trying to hype he's next boxing match, maybe he's trying to get a rematch with Conor McGregor in the boxing world, I don't know what he's doing."

But Bisping said he had heard rumours that a billion dollars was the price for a few UFC fights and that would be an attraction.

"Who wouldn't watch if? – I'd watch it – of course I would.

In December, UFC President Dana White confirmed Mayweather was interested in making a deal to move into the octagon.