Turns out, Mayweather might be game – for a lot of money.

On Tuesday, the presumably retired boxing champion hopped online to tease a potential comeback, no less in the UFC’s octagon.

“They just called me not too long ago and asked me to come back,” said Mayweather on a Periscope video captured by FightHype.com. “I can come right back. If I want to, I can come right back to the UFC. I can go fight in the octagon – I can go and do a three or four-fight deal in the octagon and make $1 billion.”

Since Mayweather (50-0 boxing) mopped the ring with McGregor (21-3 MMA, 9-1 MMA, 0-1 boxing) in August, there’s been speculation about an immediate rematch – and both fighters have fueled the fire.

On a press tour for “The Money Fight,” Mayweather said he would “whoop” McGregor in the UFC. After the summer blockbuster, McGregor claimed Mayweather promised a second go-around in the octagon.

With Mayweather’s prodigious spending habits well documented, McGregor has claimed it’s only a matter of time before the undefeated boxing champ needs to come out of retirement to maintain his lifestyle.

But it’s not the first time Mayweather has flirted with a trip to the cage. At various points late in his boxing career, Mayweather has taken shots at the UFC and proclaimed he “runs MMA.” He’s even contemplated becoming a promoter.

Given how much money “The Money Fight” made at the box office, it’s not far-fetched to think Mayweather could get the rules bent in his favor if he fought in the octagon. But if he were to step into McGregor’s world as an MMA fighter, he would be the one massively out of his league.

Would millions of people pay $99.95 to see him get obliterated three or four times? That’s the billion-dollar question.

For complete coverage of “The Money Fight,” check out the MMA Events section of the site.

The Blue Corner is MMAjunkie‘s official blog and is edited by Mike Bohn.