Aberdeen have reported Celtic's Aleksandar Tonev for allegedly racially abusing Shay Logan during their Premiership clash at Parkhead on Saturday.
Press Association Sport understands the Dons defender immediately reported the alleged second-half incident to referee Bobby Madden and skipper Mark Reynolds before informing manager Derek McInnes.
Fourth official Crawford Allan and Celtic were also made aware of the allegation by the Dons management team.
The Scottish FA is awaiting the referee's report which should arrive on Monday.
Celtic were contacted by Press Association Sport but have yet to comment.
Bulgaria winger Tonev, 24, was making his belated Celtic debut after arriving at Parkhead this summer on a one-year loan deal from Aston Villa with a groin injury.
A Celtic spokesperson told Press Association Sport: "We have spoken to the player and he has stated that the accusation made is not true."