Amir Khan's promoters claim he has been offered a rematch with Lamont Peterson after they were told by the International Boxing Federation that the "mystery man" seen at ringside during last month's fight was one of their officials.
The British boxer on Thursday used his Twitter account to post a series of images of the man, seen wearing a dark hat, and to draw attention to his movements around the judges' table.
Peterson won Khan's IBF and World Boxing Association light-welterweight titles after a disputed points decision.
Richard Schaefer, the chief executive officer of Golden Boy Promotions, claims the man has now been identified as Mustafa Ameen, an IBF official, who was given accreditation for the fight despite not being directly involved in it.
"His name is Mustafa Ameen, and the IBF have confirmed to us his name, and they have confirmed to us that he's involved in an official capacity with the IBF," Schaefer told Sky Sports News. "However, he was not in Washington in an official IBF capacity, but the IBF asked the Washington commission to issue him a credential so that he could attend the fight."
Schaefer also claimed that the WBA have offered Khan a rematch with the American, and urged the IBF to follow suit.
"We have been informed today by the WBA that they will order an immediate rematch," he said.
"We received a verbal confirmation today and we will get a written confirmation by next Tuesday.
"That means that no fighter can take an interim fight, that the next fight for Peterson would be a rematch.
"We hope that the IBF will follow because that's the least they can do. The ruling of the WBA to order an immediate rematch should put additional pressures on the IBF."
Schaefer is also hopeful that the outcome of the fight will be changed to "no contest", allowing Khan to retain his belts, but said: "It's difficult to guess the no-contest ruling. I certainly hope this could happen."
Khan has been vociferous in his criticism of the decision that cost him his titles, even before this latest development.
A split decision went in favour of hometown fighter Peterson in Washington on December 10 after Joe Cooper, the referee, twice docked points from the Englishman during the fight.
Khan was also left bemused by the long delay between the fight ending and the result being announced and the fact that judge George Hill's scorecard appeared to have been amended with regards to the seventh round.