There have been various media reports claiming that Mayweather will be facing WBA Welterweight Interim Champion Andre Berto, but that has now been shot down by Showtime Sports executive vice president Stephen Espinoza.
In a chat with Boxing Scene, Espinoza said that nothing was confirmed as details still had to be finalised.
"Nothing has been finalized yet," Espinoza told Boxing Scene. "As soon as everything is finalized, an announcement will come immediately.
"There are a lot of details that have to be finalized, and there are a lot of people working to get (the fight) done as soon as possible," he added.
On social media, the undefeated Mayweather confirmed that he was back training but did not reveal who is opponent would be.
His last fight was in May when he won on points against Manny Pacquiao in "The Fight of the Century".