Khan, 28, is said to be behind Andre Berto and Karim Mayfield in the pecking order to meet Mayweather in the final fight of his deal with CBS/Showtime in eight weeks time and believes that either of his rivals for the fight would be a step down from him.
“I think he is [becoming bad for boxing]. I’ve always asked, why finish your career on a low note? People want to see him finish his career on a high, fighting the guys people want to see him fight,” Khan told Sky Sports.
“The fans all want to see him fight against Amir Khan. Does he really want to end his career by fighting someone he knows he’s going to beat and beat convincingly?
“Everywhere I go people are asking whether Floyd is going to man up and fight me. I’m just waiting on him.
“I spoke to Al Haymon, who is also Floyd Mayweather’s advisor the other day and he said even he doesn’t know what Floyd’s going to do.
“I think the whole world of boxing is waiting for Floyd’s decision before they can make their own moves.”
Unable to train due to his practising of Ramadan, Khan faces an uphill battle to be ready for the fight if indeed selected by Mayweather, although the likelihood is that Berto will get the nod for a fight that will go out in the US on free-to-air TV.