"We pay you $25 million, we’ll pay Conor $25 million and then we’ll talk about pay-per-view at a certain number. There’s a real offer,” White said.
Despite the sum, the offer is not likely to stir enough interest from Mayweather.
Earlier this week, Mayweather said he would fight McGregor for a guaranteed $100 million while offering the UFC lightweight champion $15 million and a share of pay-per-view buys.
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"I'm a businessman and it makes business sense," the 39-year-old American, who retired in September 2015 after compiling a 49-0 record, told ESPN this week. "Bring him over to the boxing world, and I'll show him what it's like."
Irishman McGregor, the UFC's biggest pay-per-view draw, has been challenging Mayweather to a showdown for months.
Mayweather, who won world titles in five weight divisions, took home earnings in excess of $800 million over his 19-year boxing career including an estimated $230 million total from his 2015 "Fight of the Century" against Manny Pacquiao.
(Reporting by Larry Fine in New York; Editing by Pritha Sarkar)
