by Edward Chaykovsky

Top Rank's CEO Bob Arum believes Floyd Mayweather Jr. has taken serious liberties with Amir Khan and wasted away months of the British boxer's career.

Khan, inactive since last June's tough win over Julio Diaz, has been sitting back waiting for Mayweather to announce his opponent for May 3rd at the MGM Grand in Las Vegas.

In order to ensure he would land the Mayweather fight, Khan withdrew from a planned December title clash with then IBF champion Devon Alexander. A decision by Khan that many criticized, as a victory over Alexander and a world title would have solidified his claim to landing a Mayweather shot.

While for months Khan appeared to be the frontrunner and probably choice, many now believe that Mayweather will face WBA champion Marcos Maidana - and Arum is one of them.

Khan, who claims to have signed a contract for the fight several weeks ago, has no idea what's going on.

"What he has done to Amir Khan is absolutely disgraceful, whether he ends up fighting him, or he doesn't," Arum told Telegraph Sport's Gareth Davies.

"My feeling is he is not going to fight him, but it's disgraceful to do that to another human being because you are in a position to do that. Just because he has the power where you can do something like that.

"If a promoter did it, if a Bob Arum or a Frank Warren did it the press would be all over them. They have allowed Mayweather to get away with this s***. It's terrible.

Arum's advice to Khan? Dump Golden Boy Promotions, dump the Mayweather fight, and find a new opponent and a new promoter to handle his career.

"Amir Khan has put himself in a position where he can be humiliated. He's like a laughing stock. Terrible. Absolutely terrible," Arum said.

"He's not fighting back and telling these guys to get lost. Get another promoter, maybe go back to Frank Warren, get another opponent and tell them to piss off."