Amir Khan last night accused an unidentified man of "interfering" with the judges at ringside during his defeat to Lamont Peterson.
Khan's appeal against the controversial points decision in December will be held later this month, with the Bolton fighter unhappy with the performance of referee Joe Cooper - who deducted two points from Khan for pushing - and alleged irregularities with the scorecards.
But the 25-year-old yesterday pre-empted the appeal by using his Twitter account to send out a number of images of the fight in Washington.
The 2004 Olympic silver medallist is concerned about the appearance of the man, unknown to him, at ringside during his defeat to hometown fighter Peterson, which cost him his WBA and IBF light-welterweight titles.
Khan claimed the man should not have been talking to fight supervisor Michael Welsh.
Khan posted on Twitter, in a series of messages: "watch the fight from 9.10 seconds of this video ther is a guy wearing a grey suit with a blue shirt wearing a hat.
"Sat on the main judges panel at the front on the right hand side 3rd to the end.
"No1 knows who this guy is and he is now bieng asked to move by Michael Walsh [understood to be Michael Welsh] who is the main supervisor for the wba as he should be sat there.
"He now gets a chair and sits slightly infront of OscarDeLaHoya and my father.
"At the beginning of round 2 he manages to squeeze in at the front again sat next to Michael Walsh.
"Now the IBF and the WBA have still not confirmed who this guy is till this date and what he was doing there.. Now the interesting part.
"Now this guy doesn't do anything apart from watching the fight but that's only until round 6 when he starts to interfere!
"From round 6 all the way through to round 12 this guy starts to interfere with what Michael Walsh is doing and they are both not watching the fight, watch the video and have a look for yourselfs.
"This is what I meant on how he was interfeering, as no one is allowed according to the rules to touch hold the scorescards or even talk to the judges n commision during the fight.
"There are 3 judges in a fight n all have different colour slips, n at the end of evry round thy get passed on to the wba ibf n dc commision.
"This pic shows here in round 6 the guy wearing the hat clearing picks up one of the judges white slips n if you watch the video slides it down and towards him.
"And this guy doese it again at the beginning of round 7, n carries on throughout all the way to the end of the fight wtf?
"Again in round 8 and round 9, cleary not watching the fight at all and not allowing Michael Walsh to watch too.
"This time in round 11 he's seen here clearly picking up a yellow judges slip.. Strictly againts the rules."
He continued: "I've read in some articles and people have also told me that after the fight Michael Walsh the guy in the red tie apparently said his score cards didn't match up to the others, it wasn't fair and he looked really scared and he was told to butt out and there was nothing he could do.. Since then no one has heard from him.
"I want Michael Walsh to come out and speak out about what was going on, its only right and fair to do so."