Celtic face disciplinary action from UEFA over the contents of a banner displayed by their fans during the 3-0 Champions League defeat against AC Milan on Tuesday night.
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The faces of Scottish historical figure William Wallace and IRA hunger striker Bobby Sands were depicted alongside the lyrics: "The terrorist or the dreamer, the savage or the brave, depends whose vote you're trying to catch or whose face you're trying to save," in the section of Parkhead housed by a set of supporters entitled the Green Brigade.
A UEFA statement read: "Disciplinary proceedings have been opened against Celtic FC for an incident of a non-sporting nature (illicit banner: Art. 16.2 of the disciplinary regulations) at (Tuesday) night's UEFA Champions League match against AC Milan in Glasgow.
"The case will be dealt with by the UEFA Control and Disciplinary Body meeting on December 11."
The rule UEFA referred to states that clubs are liable for “inappropriate behaviour on the part of their supporters... even if they can prove the absence of any negligence in relation to the organisation of the match."
The "inappropriate behaviour'' includes the “use of gestures, words, objects or any other means to transmit any message that is not fit for a sports event, particularly messages that are of a political, ideological, religious, offensive or provocative nature."
Celtic were fined approximately 4,200 pounds after supporters let off fireworks in their Champions League qualifier against Cliftonville at Celtic Park in July.
Information from the Press Association was used in this report.