Amir Khan believes Floyd Mayweather Jr is in danger of 'messing his own legacy up' if he continues to refuse to fight him.

The unbeaten American (48-0-0-KO26) beat Manny Pacquiao in May and claims he will fight for the final time on September 12 - naming Andre Berto and Karim Mayfield as the leading candidates for his ring farewell.

Khan (31-3-0-KO19) has made no secret of his desire to secure a big-money clash with 38-year-old Mayweather but has thus far been rebuffed, although two weeks ago, the Bolton fighter revealed he had been involved in a heated exchange with Floyd Mayweather Sr.

Speaking to Ringcast.net, Khan said: "We've been talking to Al Haymon and hopefully we'll find out in a week what's going to happen. Mayweather wants to fight on September 12 and I'll be ready for that date.

"Floyd says he thinks he needs an easy fight now because he's proved himself by beating Pacquiao. He wants to fight Andre Berto and Karim Mayfield. No disrespect to those two because they're good fighters and good friends of mine too.

"I think he's messing his own legacy up. He needs to finish on a high. What he's probably going to do is leave the game on a low and I think that's the worst thing to do.

"I spoke to his father and he says it'd be an easy fight if Mayweather fought me. If it'd be so easy then why not do it?

"Mayweather hasn't announced who he wants to fight yet. He's mentioned a few names but mine should've been in there because it's a fight that the fans want and it's a fight that would make big money."