Former boxer Floyd Mayweather says he "started the rumour" about a potential bout with a mixed martial arts fighter - thought to be Conor McGregor.
Five-weight world champion Mayweather, 39, said he would want $100m (£69.3m) to fight the 27-year-old Irishman.
"Keep your fingers crossed, it may be a boxer versus an MMA fighter," Mayweather told fighthype.com.
"It was a name that was shot at me. It may not be a rumour."
Mayweather's father recently said his son had told him he would face "some kind of MMA fighter", while McGregor told BT Sport he wants a "billion-dollar fight" against the American.
Mayweather's 49th and last fight was a unanimous decision over Andre Berto in September, after which he said: "My career is over, that's official."