BT Sport were forced to apologise after showing an offensive banner during the Champions League clash between Shakhtar Donetsk and Celtic.
Celtic fans revealed a banner which reads 'F**k the Crown' in their end of the stadium.
BT Sport cameras panned to the banner, with the play-by-play commentator apologising for showing it during their broadcast.
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It comes after Queen Elizabeth II's passing last Thursday.
Her death led to the cancellation of fixtures in the UK, with Bayern Munich fans protesting against the impact of the Queen's death on fixtures.
Their supporters revealed a banner during their match against Barcelona on Tuesday, which read: "Last minute match delays and bans because of a royal’s death!? Respect fans!"
Celtic's cross-town rivals Rangers, meanwhile, have urged their fans to arrive early for their Champions League match against Napoli tonight as they plan a tribute for the Queen.
"Her Majesty Queen Elizabeth II will be honoured this evening at Ibrox with a minute’s silence, a display created by the Union Bears, and a rendition of the Nation Anthem," the club tweeted.
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"If you are attending tonight’s match, we encourage all supporters to be in their seat for 19:50."
Nasir Jabbar