Conor McGregor roasted and praised Floyd Mayweather for announcing his comeback to action.
Mayweather shocked, and confused, the world on Monday when the 50-0 boxer revealed he would be coming out of retirement to fight kickboxer Tenshin Nasukawa.
Rizin will stage the unusual match-up at their annual 31 December show in Japan, although it has yet to be confirmed what combat rules Mayweather will be competing under.
Nasukawa is a rising star in Japan and has a 4-0 MMA record, and McGregor echoed the sentiments of many baffled fight fans in his response to the news.
Is that a tracksuit or a sauna suit Floyd, McGregor said.
Is it hot in Tokyo or whats the story here? that climate change is no joke f*** me.
What in the f*** is going on here? Whos this little p**** next to you ? Thats mad s***. Like something out of rush hour 5 or something.
Chris tucker and Jackie f****** Chan back in this bitch. F****** brilliant. Mad little b****** you are Floyd. Fair f**** to you mate. No lie. F*** it.
McGregor and Mayweather went toe-to-toe in a boxing match last year, in which the Irishman was thoroughly beaten over ten rounds.
Mayweather has said little about what fans can expect from his upcoming comeback.
I can wrestle, I can wrestle a little bit. I can box a lot a bit, he said.
We will just see. I can do it all. I can do anything if I set my mind to it.
I am pretty sure that when I speak with the guys from my team we are going to get on the same page so we can go out there and do what we have to do.