Uefa are to act against Celtic after fans held up a series of banners paying tribute to IRA terrorist Bobby Sands during last night's defeat by Milan at Parkhead.
European football's ruling body have opened disciplinary proceedings and its control and disciplinary committee will deal with the case on December 11.
The banners, unfurled before kick-off, depicted images of William Wallace and Bobby Sands and the message: "The terrorist or the dreamer? The savage or the brave? Depends whose vote you are trying to catch or whose face you are trying to save."
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."
Uefa's code prohibits "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".
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 after supporters let off fireworks in their Celtic Park qualifier against Cliftonville in July.
In another incident during the match, a 25-yearold man has been reported to the procurator fiscal after a laser pen was allegedly pointed at AC Milan goalkeeper Christian Abbiati.
The goalkeeper appeared to be targeted as his side beat Celtic 3-0 to end the Glasgow club's European campaign.
A Police Scotland spokeswoman said: "We can confirm a 25-year-old man is the subject of a report to the procurator fiscal in connection with allegedly shining a laser pen on to the pitch at Celtic Park during the match."
The incident came after police launched an investigation into lasers being shone at aircraft landing at Glasgow.
Laser lights were beamed on to nine planes descending into Glasgow airport between 6pm and 10pm on Monday night. In some cases, the lasers were shone into the eyes of the pilots.
Officers said the "dangerous, reckless" practice could have distracted pilots and they are searching for those responsible.
It is believed the lights came from the Duntocher, Drumchapel or Knightswood areas.
Inspector Bob Smith said: ""All these planes were carrying passengers. Thankfully this time no-one came to any harm but doing this is extremely dangerous, not to mention stupid and reckless."
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