Floyd Mayweather has responded to Dana White's "real" offer for a bout between Mayweather and Irish UFC star Conor McGregor.

White said in an interview with Fox Sports 1 that he would give Mayweather and McGregor both US$25 million and a share of pay-per-view revenue.

"He's a f**king comedian," Mayweather told TMZ.

Mayweather deflected any follow-up questions, instructing the interviewer to look at his luxurious Swiss Hublot watch.

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Mayweather earlier told ESPN that US$100 million was his number for anyone trying to lure the 40-year-old from retirement.

"I'll tell you what Floyd, here's a real offer, and I'm the guy who can actually make the offer, and I'm actually making a real offer," UFC President White told Colin Cowherd on FS1. "We'll pay you 25 million, we'll pay Conor 25 million, and then well talk pay-per-view and a certain number. There is a real offer."

The offer still seems pretty far away for Floyd.