Floyd Mayweather Jr. has done it yet again.

“Money” stole headlines last night with the announcement that he’d be fighting for the Japanese mixed martial arts (MMA) promotion RIZIN FF. Mayweather will fight Tenshin Nasukawa at Rizin 14 on December 31st from the Saitama Super Arena in Saitama, Japan. The ruleset for the contest has yet to be determined; however, many assume it will not be under MMA rules.

Should Mayweather allow Nasukawa to even kick, it could be a rough night for the 50-0 undefeated boxer. At least, that’s the thinking of longtime UFC commentator Joe Rogan. Rogan recently took to Instagram to react to the news of Mayweather’s new venture with Rizin. Rogan said he’s happy people will look up Nasukawa’s name and watch some of his past fights.

He also said that, depending on the fight’s ruleset, Mayweather could be in for a rough night in Japan:

“I’m sure many of you combat sports fans have heard that Floyd Mayweather has signed to face Tenshin Nasukawa in Japan on New Years Eve. I don’t know what kind of ‘special rules’ they’re supposed to be fighting under but I just like the fact that it’s going to happen and that people get to google Tenshin’s name and see some of his fights.

“He’s a true striking genius. I doubt Floyd is going to agree to any rules that allow Tenshin to kick, but if he does it could be a terrible night for him. This kid is the truth.”