Celtic and Lazio have been hit with a UEFA charge after the supporters of both clubs sang 'illicit chants' during their Europa League clash at Parkhead last week.
The Scottish Premiership club will also face a further charge after the unveiling of an 'illicit banner' at the ground.
The chants were not racist but, related to the use of obscene language while there were two banners displayed in the Celtic end of the ground.
One of those depicted the former Italian dictator Benito Mussolini while the other contained swearing written in Italian.
Uefa's control, ethics and disciplinary body will adjudicate on the matters on 21 November.
It is the third time this season alone that Celtic have been hit with a UEFA charge.
The Scottish Champions had to pay a €12,000 fine to the governing body after being found guilty of setting off fireworks during their Europa League home win against Romanian side Cluj.
They were slapped with a €12,500 fine in August for setting off fireworks and throwing objects during the Europa League playoff win against AIK in Stockholm.
Before the meeting with the Serie A side last week, Lazio supporters were filmed marching through Glasgow, giving fascist salutes.
The Celtic supporters responded with the display which depicted Mussolini hanging after his death.
The home side came back from 1-0 down to win the match 2-1 but the reverse group fixture will be played next Thursday, November 7.
Both clubs are fearful over the match which sees Celtic travel to Rome and measures are being put in place to try and reduce the chances of any trouble breaking out.
The city's main tourist attractions will be heavily policed and an alcohol curfew will be in place from 18:00 on Wednesday until 07:00 on Thursday.
Supporters will also be advised to be cautious with regard to the wearing of club colours.
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