British tabloid, The Sun, had claimed Friday that a summer boxing bout between the pair was set to be announced
in the coming weeks.
But the report was greeted with skepticism by most observers. "It's not true. It's just a tabloid story," UFC president Dana White told
Speaking to Fighthype.com
late Saturday, however, 39-year-old Mayweather said of potentially coming out of retirement to face an MMA fighter: "It's possible. The rumors that you've all been hearing is the rumors that I started."
"It may not be a rumor. Keep your fingers crossed. It may be a boxer versus an MMA fighter. We just don't know."
Mayweather, who is undefeated in 49 fights, went on to state that the minimum he would expect to earn for gracing the ring once more would be $100 million.
Later Sunday, McGregor tweeted a graphic of himself and Mayweather squaring off with an accompanying message of "MMA Vs Boxing."
McGregor was due to fight Nate Diaz at UFC 200 in July -- a rematch of the March bout in which Diaz triumphed by submission -- but was pulled from the card after refusing to fulfill promotional duties.
The 27-year-old Irishman is the UFC's most recognizable fighter and has a record of 19 wins and three losses over his MMA career.
Mayweather last fought in September, announcing his retirement shortly after, although many believe he will fight again in order to reach a half century of victories.