As BoxingScene.com previously reported, UFC champion Khabib Nurmagomedov has taken a page out of Conor McGregor's playbook and issued a challenge to undefeated five division world champion Floyd Mayweather.

Nurmagomedov's challenge came in a video posted on Instagram by Mayweather's company CEO, Leonard Ellerbe, who indicated he ran into the UFC fighter during the World Boxing Super Series doubleheader in Russia.

Both Ellerbe and Khabib were ringside for Saturday's card at the Ekaterinburg Expo in Ekaterinburg.

Khabib did not say whether he wished to fight Mayweather in a boxing or UFC match. Like McGregor, the Russian has no previous experience as a professional boxer.

"Let's go Floyd. We have to fight now: 50-0 versus 27-0," Nurmagomedov said with Ellerbe standing next to him smiling. "We are two guys who never lose. In the jungle there is only one king. Of course, I am the king because he cannot drop McGregor but I dropped him easily. Let's go."

McGregor made as much as a $100 million last year by taking on Mayweather in a lopsided boxing match. Mayweather, who retired afterwards, appeared to carry McGregor in the early rounds before stopping the Irishman in the 10th to improve to 50-0.

Mayweather took to social media to respond to the challenge. The add fuel to the fire, Mayweather wants to see a large number on the table.

“CBS, Showtime and MGM Grand get the checkbook out! Go to Leonard Ellerbe’s page to view Khabib Nurmagomedov challenging me. Let’s make Las Vegas great again,” Mayweather stated.

Last weekend, Khabib retained his UFC lightweight crown, beating McGregor by fourth-round submission. It was McGregor's first UFC bout in two years.

There was wild drama in the aftermath, when Khabib climbed out of the Octagon to fight with a member of McGregor's entourage who had been taunting him. McGregor also exchanged punches with members of Khabib's team.