Floyd Mayweather is never one to let an opportunity pass by.

A day after UFC lightweight champion Khabib Nurmagomedov issued a challenge to put his 27-0 MMA record on the line against Mayweather’s 50-0 boxing record, Mayweather took to Twitter to offer a response and, as usual, it sounds like he’s amenable if the price is right.

“CBS, Showtime and MGM Grand get the checkbook out!” Mayweather wrote.

Nurmagomedov was seen at a boxing event with Mayweather promotions CEO Leonard Ellerbe on the weekend and a clip was released in which Nurmagomedov proposed a fight between “two guys never lose”. The unbeaten Russian recently added to his impressive resume with a dominant submission win over Conor McGregor at UFC 229, though the victory was somewhat overshadowed by the post-fight melee that followed.

A challenge from a UFC star is nothing new for Mayweather, who memorably feuded with McGregor for over a year before the two engaged in the most highly publicized crossover fight in history. Mayweather went on to defeat “The Notorious” in a boxing match on Aug. 26, 2017, via 10th-round TKO.

Neither Nurmagomedov nor Mayweather have indicated what kind of rules they might fight under should this matchup ever take place and for now it appears to be nothing more than two combat sports stars posturing. Just like Mayweather-McGregor once was.

Update: Nurmagomedov has ruled out one possible site for their fight.