The long-rumored bout between undefeated American boxing champion Floyd Mayweather and mixed martial arts champion Conor McGregor is halfway to becoming a reality after the Irish signed a deal for the fight.

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White confirms McGregor has signed on for Mayweather fight

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VIDEO White confirms McGregor has signed on for Mayweather fight. Source: TNT White confirms McGregor has signed on for Mayweather fight

UFC President Dana White broke the news during a television interview for TNT following the NBA's Eastern Conference Finals matchup on Thursday.

"The McGregor side is done, I'm starting to work on the Mayweather side now," White said.

"I've got one side done. If we can come to a deal (with Mayweather) the fight will happen."

Mayweather and McGregor. Image: Getty

McGregor confirmed the deal in a statement released to Themaclife.com.

"The first, and most important part of this historic contract has now officially been signed off on. Congratulations to all parties involved. We now await Al Haymon and his boxer's signature in the coming days," the statement read.

Terms of the deal were not announced.

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McGregor, 28, is the biggest pay-per-view draw in UFC's mixed martial arts while the 40-year-old Mayweather retired in 2015 with a 49-0 record.

The two sides have been exchanging verbal spats and challenges for several months.

The proposed bout would be straight boxing match.

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