Promoters for British boxing star Amir Khan have claimed that he has been offered a world title rematch with Lamont Peterson after the International Boxing Federation revealed to them that the “mystery man” seen ringside at last month’s fight was one of their officials. Khan lost both his WBA and IBF light-welterweight titles after home-town fighter Peterson was awarded a controversial split-decision victory following their bout in Washington on December 10. The 25-year-old had questioned the performance of referee Joe Cooper and aired grievances over alleged inconsistencies with the judges’ scorecards, before turning his attention to the mystery individual at ringside. Khan has already appealed against the defeat, but on Thursday he took to Twitter to draw attention to the unidentified man’s actions during the fight. There was no immediate identification of the man, but Richard Schaefer, chief executive officer of Golden Boy Promotions now claims the IBF told him that he was one of their officials named Mustafa Ameen, who was given accreditation for the fight despite not being directly involved in it.