The Green Brigade have accused UEFA of being "complicit in genocide" in a display ahead of Celtic's match against Braga.
The supporters group unveiled a large display inside Celtic Park on Wednesday night, calling for Israeli clubs to be kicked out of UEFA competitions.
The banner read: "UEFA is complicit in genocide by normalising 'Israel'.
"Kick them out now".
UEFA paused reported plans to potentially ban Israeli clubs from competitions earlier this week amid discussions over a proposed peace plan, announced by Donald Trump.
Only Maccabi Tel Aviv remain in European competition from Israel this season.
The Celtic fan group previously led a major protest against Israel over the ongoing conflict in the Middle East.
A "Show 'Israel' the red card" display was staged during the Champions League knockout play-off match against Bayern Munich earlier this year.
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The Green Brigade have long displayed support for Palestine amid the conflict with large-scale displays at matches.
After a display back in 2023, Celtic had warned "political messages and banners" were not welcome inside Celtic Park.
A display before a match against Kilmarnock read: "Free Palestine, victory to the resistance".
A statement at the time read: "Banners displayed in a section of Celtic Park prior to Saturday's game do not represent the views of Celtic Football Club and we disassociate ourselves from them. We condemn the display of such messages at Celtic Park.
"Celtic is a football club and not a political organisation. One of our core values from inception is to be open to all regardless of race, colour, politics or creed."
