Celtic chief executive Ian McLeod has condemned the fans who defied his appeal to stop singing pro-IRA sectarian songs.
Last week McLeod sent letters to more than 50,000 Celtic season ticket holders asking for their assistance in ridding the club of bigots.
However, the IRA chants at Sunday's live BBC match with Dundee were perhaps louder than ever as hundreds of Celtic followers stubbornly refused to obey the club's plea.
"Some of the singing was disappointing but predictable," said McLeod.
"We have a vocal element who are entrenched in their views and were going to make some sort of demonstration at the first away game.
"I have embarked on a long-term programme and I'm not naive enough to think you can change attitudes with just one letter.
"I am not here to dicatate to anyone as to their political views, but we are a football club with no political alignment."