Gilberto Jesus Mendoza, the vice-president of the World Boxing Association, says the unidentified man accused by Amir Khan of interfering with the judges during his defeat to Lamont Peterson last month is "unknown" to the organization.
The Bolton fighter lost his WBA and IBF light-welterweight titles on a split decision against hometown fighter Peterson in Washington on December 10.
The 25-year-old has questioned several issues surrounding the fight - from referee Joe Cooper's performance to alleged inconsistencies with the judges' scorecards - and on Thursday night aired another grievance, relating to the appearance of an unidentified person at ringside.
Khan's appeal against the defeat will be held later this month but he pre-empted the hearing by using Twitter to send out a number of images of the fight in Washington.
Mendoza confirmed that the WBA are investigating Khan's comments, and insisted the man shown in the images is not known by the governing body.
"I am going over the facts but this man is also unknown to us," he said.
Khan had posted on Twitter, in a series of messages, a commentary of the person's movements during the fight.
The 2004 Olympic silver medallist is concerned about the appearance of the man, unknown to him, at ringside during the bout and claimed the man should not have been talking to WBA fight supervisor Michael Welsh.
Khan's business manager Asif Vali said they have asked for explanations from the various governing bodies relating to a number of their concerns but have yet to receive answers.
"There are four or five different things that require answers and my job is to ensure we get those answers," he said.
"I want to know the reason this person sat there and what's going on. We did the table plan with Golden Boy Promotions and the WBA official was already in his seat and the IBF official was already in his seat, so who is this person? What's he doing talking to the WBA? Why is he handling the slips?
"These are legitimate questions and if they give us sufficient reasons for it then I'll accept it. I want to see what the reasons are.
"We're not saying there is foul play involved in any way, shape or form. I just need the answers for the sequence of events that have taken place. Nothing else. I'm not accusing any of the bodies. Lamont Peterson is the champion and good luck to him for 2012.
"My job is to get these answers."
