Floyd Mayweather thinks he has three fights left in him but has denied reports that one of them could be against Manny Pacquiao.
The 37-year-old American is preparing for a much-anticipated rematch against Marcos Maidana in Las Vegas on Saturday.
Mayweather beat Maidana in May this year and expects to retire in 2015.
A fight between Mayweather and Pacquiao " arguably the two biggest names in boxing " is a prospect that leaves fans of the sport salivating.
But when quizzed about a fight with Pacquiao, Mayweather said: "[The reports are] not true.
"I've only got two more fights left [after Maidana].
"I can't say what the future holds. But [Pacquiao's promoter] Bob Arum and Pacquiao are trying to sell tickets for the Algeri bout."
Pacquiao faces Chris Algeri in defence of his WBO welterweight title on November 22.
Mayweather is unbeaten in 46 professional fights but was tested by Maidana in May, before winning by majority decision.
And Maidana said he will employ different tactics on this occasion.
"I am very well prepared but this time around I already know him," Maidana said.
"I am going to pace myself this time. I am not going to waste punches."