Amir Khan claims Timothy Bradley is too scared to take him on in a showdown to become undisputed light-welterweight king.
Khan, who last weekend added the IBF belt to his WBA title by overcoming Zab Judah in their unification fight in Las Vegas, wants to contest one more bout in his current division before focusing on the welterweight category and a potential clash with Floyd Mayweather in 2012.
The 24-year-old would ideally like WBC and WBO champion Bradley to be his next opponent, but the American has already pulled out once after verbally agreeing to the fight - with Judah stepping in as his replacement - and Khan is not expecting much further co-operation.
"I don't think the fight against Bradley will happen because I think he is scared to take it on," Khan told Press Association Sport.
"He knows that he will get beaten, and where does he go from there?
"There are other big fights out there for me. In the future we will look at Mayweather, but there is also Erik Morales, or the winner of Marcos Maidana against Robert Guerrero.
"There are still a few names in the 140-pound division and I think I have one more fight in the division before moving up to 147 pounds where the bigger challenges are.
"The undisputed unified champion is something I've always wanted to be, but if the Bradley fight doesn't happen, then at least the world will know I wanted the fight and he pulled out.
"He was just running scared. I really think the organizations should strip him of the two titles he has at the moment and maybe vacate them for the next opponent I face, because then at least that gives another fighter the option to fight for a world title."