Bolshoi Ballet artistic director Sergei Filin says he is "absolutely certain" he knows who is behind an acid attack that left him badly injured last month in Moscow.
Filin told the BBC he would not name names until investigators are ready to make an announcement.
He said he was sure the aim of the attack was to remove him as artistic director and destroy the company's reputation.
Filin, 42, is due to fly to Germany next week to continue his treatment.
His eyes were badly damaged in the incident on 17 January. He has since undergone five operations.
Filin said he knew that some people had disliked the way he was taking the ballet company, which is known for its infighting and rivalries but believed he had no "obvious enemies".
He also said he wished he had taken more seriously the months of threats and harassment he underwent before, accepting now that it was "leading up to the tragedy to come".