Ross County are working to identify members of the home support who aimed sectarian language at Celtic players after the winning goal in Wednesday's Premiership clash.
Anthony Ralston's 97th minute winner nicked all three points for Ange Postecoglou's men and sent thousands of Celtic fans on the long trip back to Glasgow happy.
There was also a pitch invasion in the celebrations that followed but at the other end of the ground members of a Staggies singing section were could on video aiming vile slurs at the Celtic players.
And the Dingwall club have assured they are aiming to find the culprit.
A club statement read: "Ross County Football Club are aware of an incident of sectarian behaviour which occurred within our Singing Section after Celtic scored the winning goal on Wednesday night. We strongly condemn this type of discriminatory behaviour and language, which has no place in football or wider society.
"We are working to identify the individuals involved and will take the strongest possible action against them. An investigation is underway within the club and Police Scotland have been notified with a view to carrying out a criminal investigation.
"Any supporter who was present in that area of the ground and has information or recordings that can assist this investigation should contact the club.
