The Scottish Premier League have opened an investigation into allegations of pro-IRA chanting at Celtic Park.
The SPL's operations officer Ian Blair confirmed that, in his role as match commander at the Celtic versus Hibernian Clydesdale Bank Premier League game at Parkhead on October 29, former referee and senior policeman Eddie Smith complained to a match delegate about songs sung during the goalless draw.
"Eddie mentioned to our delegate that there was pro-IRA chanting from one specific section of the stadium," Blair told the Daily Record.
"It was included in the report and is now subject to an ongoing investigation."
It has been reported that two arrests were made during the Hibs match.
Blair added: "I am currently gathering information about what happened during the match when the arrests were made.
"Eddie has mentioned that there was pro-IRA chanting but we need to find out more about when it happened and what exactly went on.
"We also have to establish that Celtic, as I am sure they will have, co-operated fully with the police in the aftermath of this event."
Celtic are already facing disciplinary proceedings from UEFA, on December 8, over "illicit chanting" during their Europa League tie against Rennes at Parkhead on November 3.
It was reported that Smith made the complaint to the UEFA delegate on the night.
Celtic last night confirmed they will co-operate fully with UEFA's investigation.