Celtic have been hit with a 15,000 euros (£12,720) fine by UEFA after it was ruled that a section of their support had engaged in “illicit chanting”.
The Parkhead club were informed last month that they faced disciplinary action over the behaviour of some fans during their Europa League group stage match against Rennes on November 3.
Any appeal must be lodged within three days of the contested decision being received in writing. An appeal fee of 1,000 euros (£856) is payable.
UEFA’s control and disciplinary body met on Friday to consider the matter but did not announce their verdict until Monday due to the volume of cases they handled.
Celtic have not yet commented on the ruling but expressed their surprise at being investigated when the hearing was announced last month.
A club spokesman said on November 14: “Celtic supporters have a magnificent record of positive support for their team, something recognised by both UEFA and FIFA in recent years and we are extremely proud of this reputation.
“Therefore, the club will co-operate fully with any UEFA investigation.”