Granted, Khabib Nurmagomedov doesn't have the kind of crossover drawing power that McGregor does but the undefeated Russian has definitely become more of a mainstream name after dominating "The Notorious" at UFC 229.
Nurmagomedov beat Conor McGregor in a UFC showdown earlier this month before calling out Mayweather.
But 30-year-old Nurmagomedov has poured water on that idea, having gotten into trouble with the Vegas authorities after the post-McGregor riot he instigated.
"Let's go! Why not?"
"Hey let's go Floyd, we have to fight now", Nurmagomedov said. "50-0 vs 27-0, two guys who never lose, why not? Let's fight. Let's go". (But) in the jungle there is only one king.
"Of course I am the king because he could not drop McGregor and I dropped him easily", added Nurmagomedov, who retained his UFC lightweight title against McGregor.
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Mayweather stopped McGregor with a 10th-round TKO, but never knocked him down.
The American today confirmed he would be interested in fighting Nurmagomedov in Las Vegas.
Then Monday, Mayweather responded by writing on Instagram, "CBS, Showtime and MGM Grand get the checkbook out!".
Nurmagomedov Sr added a word of caution, however, saying that talk of a fight with Mayweather, 42, was "premature", given that the investigation was continuing into the ugly post-fight brawl that marred his son's win over McGregor.
It wasn't immediately clear if the potential fight would actually take place - or if it would occur in a boxing ring or the mixed martial arts octagon. Meanwhile, two men from Nurmagomedov's entourage climbed into the cage and attacked McGregor, who defended himself before security personnel intervened. It would certainly be interesting, and Khabib has some appeal with an undefeated record and the recent hype after steamrolling McGregor on October 6 in Las Vegas.