As reported by The Daily Mail, Mayweather - who takes on Marcos Maidana at the MGM Grand in Las Vegas on Saturday night - has already identified September 13 as the date for his next match.
However, Khan - who will go up against welterweight Luis Collazo on the undercard of that aforementioned fight - has confirmed that he could not possibly make such a date.
"‘I can’t be ready for that date. Ramadan doesn’t finish until the end of July and I would need
three months in training camp after that to prepare for a fight of this magnitude," he said.
"The earliest I can be back in the ring after my fight here is late October or early November and that will have to be against another opponent. I’ve told Floyd that and he assures me I’m still on his list. Of course I am still pursuing the fight with him but the next window for that is this
time next year."
Initially, it appeared as Bolton native Khan would be the man to step into the ring with the unbeaten Mayweather on May 3.
Much to his dismay, however, Mayweather eventually opted to set up the contest against WBA champion Maidana - evidently leaving Khan at somewhat of a loose end.
While many harbour significant doubts that Khan would ever be able to successfully defeat a man who has established a worthy reputation as arguably the most talented fighter of his generation, there is certainly no doubting the lucrative financial rewards that would go hand-in-hand with a fight against 'Money'.
Khan clearly has not given up hope of one day meeting Mayweather in the ring, either, but for now it appears as if he will have to make sure that he is victorious in his next two fights to ensure that he remains prominent in his potential opponent's thinking.