Conor McGregor has wasted little time in making sure that Floyd Mayweather knows exactly how he feels about the undefeated boxers' decision to come out of retirement once again to face Tenshin Nasukawa.
Like him as a person or not, and there's plenty of reason not to, but there's no doubt that Floyd Mayweather's 49-0 record, when he retired after defeating Andre Berto in 2015, made him one of the best boxers of the generation.
That Mayweather decided to come out of retirement, not for the first time, to make it 50-0 was admirable but the fact it was against Conor McGregor, in his first professional boxing fight, took the shine off somewhat.
Once again 'Money' went into retirement. Earlier this year he hinted at a return potentially for a rematch against long time rival Manny Pacquiao.
However on Monday morning the American did announce his latest comeback fight, but not against Pacquiao. Instead he will face Japanese kickboxer Tenshin Nasukawa on December 1st.
The rules of the fight and the weight division have yet to be decided between the two fighters and it could be under hybrid rules, as has previously been discussed for possible bouts with McGregor or Khabib Nurmagomedov.
Unsurprisingly 'the Notorious' has had his say, taking to Instagram to post: "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*ck me hahah
What in the f*ck is going on here? Who's this little pr*ck next to you ? That's mad shit. Like something out of rush hour 5 or something. Chris tucker and Jackie fucking Chan back in this bitch. Fucking brilliant. Mad little bastard you are Floyd. Fair fucks to you mate. No lie. Fuck it."
McGregor's post about Mayweather. Image: Instagram
Mayweather, McGregor, Khabib and rapper 50 Cent have been involved in quite the fourway rivalry and there has been talk of Khabib following on from his last opponent to face the boxer.
The 41 year old American hinted at the possibility of some sort of hybrid rules saying, "I wanted to do something different. I wanted to display my skills outside the US and be in a special fight. I want to give the people what they want - blood, sweat and tears."
However his Japanese opponent suggested it could be boxing saying, "It's the biggest moment in my life and I want to be the man who changes history. I'll do that with these fists, with one punch - just watch."
This will mean the back end of Mayweather's career has seen him fight a wrestler, MMA fighter and kickboxer. What's left after that?