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Mayweather vs. McGregor—is it really on?

Floyd Mayweather Jr. throws a right at Andre Berto during their WBC/WBA welterweight title fight at MGM Grand Garden Arena on September 12, 2015 in Las Vegas, Nevada.
Ethan Miller | Getty Images
Floyd Mayweather Jr. throws a right at Andre Berto during their WBC/WBA welterweight title fight at MGM Grand Garden Arena on September 12, 2015 in Las Vegas, Nevada.

The sporting world was awash with rumors over the weekend contemplating the prospect of a fight between Floyd Mayweather and Conor McGregor.

Undefeated boxer Mayweather has admitted that he started the talk of a return to the ring against a mixed martial arts fighter - thought to be UFC's Conor McGregor.

In a response Sunday, McGregor tweeted a mock-up picture of himself squaring off against the five-weight world boxing champion.

"Keep your fingers crossed, it may be a boxer versus an MMA fighter," Mayweather – now retired - told industry website fighthype.com.

"It was a name that was shot at me. It may not be a rumor."

Meanwhile, McGregor has told British media that he wants a "billion-dollar fight" against the American, while Mayweather has said he would want to be paid $100 million to fight the 27-year-old Irishman.

After Mayweather's last fight in September he claimed his professional boxing career, with an unblemished 49 wins, was over.

McGregor was pulled from a UFC event in April after refusing to fulfill promotional duties.