Amir Khan's fears that a mystery man may have interfered with the scoring during the controversial loss of his world titles to Lamont Peterson will be examined by the WBA. Khan posted a series of tweets on Thursday, accompanied by annotated YouTube footage of the fight, asking for help from the public in identifying "a guy wearing a grey suit with a blue shirt wearing a hat" who was seen moving about in the front two rows and then next to the WBA supervisor, Michael Welsh, during the fight.

At one point midway through the fight the man in question appears to reach across in front of Welsh. It is this part of the tape that raised suspicions in the Khan camp. There was confusion and an unusually long delay of about 10 minutes in announcing the majority decision in Peterson's favour.

Gilberto Mendoza, the president of the WBA, has told BBC Sport that he would examine Khan's allegations and make a response within the next 24 hours. The IBF, however, will not follow suit, informing the media outlet that "with regards to the IBF master scorecard we can assure that it has not been tampered with".

In his Twitter comments, Khan says: "the truth is finally coming out slowly but surely … if I lost fair and square then fair enough I've lost n I move on, but does it really take over 10 minutes from the final bell to decide who's won? … I'm angry as I want the rematch next to put things straight but it doesn't look like he wants it … 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."

The tape will form the main plank of Khan's appeal and those clips that show the unidentified man changing seats and talking to Welsh do raise questions about the conduct of the officials. It is highly unusual for anyone other than the referee, three judges and the appointed supervisors to handle the scorecards during a fight. If the man in the blue shirt has interfered with the scoring in any way, Khan will at least have presented a case for a rematch.