In a statement on Saturday, Preston said: “Milutin Osmajic has strongly refuted the claims of a comment made towards Hannibal Mejbri in a post-match meeting with today’s match officials.”
Speaking to BBC Sport after the game, Burnley boss Scott Parker said: “He’s hurt. I think everyone could see that at the time. Hannibal’s an emotional player and he was visibly very stressed by what was said.
“I don’t want to get into the real details of what was said, I’m sure it’ll come out in due course. Hannibal’s reported it and is bitterly gutted, so we’ll see what happens in the coming days.”
The Professional Footballers’ Association (PFA) has also contacted Burnley to offer its support.
Anti-discrimination charity Kick It Out (KIO) also commended Hannibal for immediately raising the alleged abuse with referee Kitchen.
“When allegations occur, reporting them immediately and through the right channels helps them be addressed,” it said.
“Hannibal deserves credit for bringing the incident to the referee’s attention. Speaking up takes huge courage. We also commend the officials for following the correct protocols. We expect an investigation to be carried out swiftly and sensitively.”
The two sides will meet at Deepdale again in the FA Cup fifth round on Saturday, 1 March.
In October, Osmajic was banned for eight games by the FA for biting Blackburn’s Owen Beck. He admitted the charge of violent conduct and was fined £15,000.