Celtic have been hit with a fine of 15,000 euros after their fans were reported for "illicit chanting" during the Europa League match against Rennes last month.
UEFA's control and disciplinary panel imposed the fine after the match delegate was informed of pro-IRA chanting by the Strathclyde police match commander on November 3.
The fine was announced by the European governing body on Monday after a decision was taken on Friday.
Celtic expressed their surprise at the charge when it was announced last month and said they would cooperate fully with any investigation.
The Glasgow club acknowledged notification of the fine, but will take time to decide whether to appeal.
A Celtic spokesperson said on the club's official website, www.celticfc.net: "We received notification of the fine this afternoon with no detail.
"The club is currently considering its position."