Conor McGregor has reacted to Floyd Mayweather's latest fight on Instagram

McGregor couldn't let it pass without comment

Floyd Mayweather's latest attempts to retire from combat sports have lasted all of 16 months.

The American will be making a shock comeback against Tenshin Nasukawa in Japan on New Year's Eve.

The kickboxer is just 20-years-old but is unbeaten in 27 bouts - a formidable opponent, it would seem, for Mayweather to defend his own flawless 50-0 record against.

Nevertheless, the announcement has caught the majority of the Money's fans off-guard. Nasukawa has a very high profile in his homeland, but most US spectators were left asking: 'Who?!'

Mayweather so rarely ventures outside Vegas and he is putting his reputation on the line once again. The incentive to do so, of course, is the enormous financial reward on offer.

It's quite clearly a multi-million dollar event - or else, why would the 41-year-old be interested?

Nobody is even clear on what rules, or indeed, what weight, the pair will be fighting at, as promoters Rizin Fighting Federation are yet to confirm the details.

At this stage, it all seems a little random, which is why nobody was expecting the announcement - least of all Conor McGregor, who Mayweather defeated in August 2017.

Within a few hours of the press conference, his old adversary took to Instagram to ridicule the Money's latest crossover.

McGregor couldn't resist 

"Is that a tracksuit or a sauna suit Floyd haha wtf. Is it hot in Tokyo or what’s the story here? That climate change is no joke f**k me hahah," McGregor wrote.

"What in the f**k is going on here? Who’s this little p***k next to you? That’s mad s**t. Like something out of rush hour 5 or something. Chris Tucker and Jackie f**king Chan back in this b*tch. F**king brilliant.

"Mad little b*****d you are Floyd. Fair f**ks to you mate. No lie. F**k it."

The Notorious might have still been hoping for a rematch to avenge his defeat last year, though that prospect has looked unlikely for some time.

Mayweather beat McGregor in August 2017

Instead, the Irishman is now focused on a return bout against Khabib Nurmagomedov - if the UFC will allow it given the ugly scenes that marred the Russian's victory last month.

While McGregor probably wants to check his tone after the humiliation of that affair, he is not the only one whose eyebrows will be raised at the prospect of Mayweather vs Nasukawa.

It's not exactly the rematch against Manny Pacquiao we were teased with.

When is he finally going to walk away? 

What do you make of Mayweather's latest comeback? Have your say in the comments. 

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