Celtic supporters chanted and held up an anti-monarchy banner during a minute's applause in memory of the Queen Elizabeth II ahead of their Scottish Premiership match against St Mirren on Sunday. Watch the video below.
The Scottish FA had given clubs the option of whether and how to pay respects to the Queen this weekend, after postponing the last round of games in the wake of her death.
Paisley club St Mirren opted to hold a minute's applause instead of a minute's silence ahead of Sunday's match at St Mirren Park.
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A large number of away supporters could be heard singing an anti-monarchy chant while the minute's applause was held.
Fans also held up a banner which read 'If you hate the royal family clap your hands'.
At the end of the minute, St Mirren supporters booed in apparent disgust at the Celtic supporters' behaviour.
Meanwhile, Scotland's assistant manager Steve Carver - who was attending the match with Scotland boss Steve Clark - was seen shaking his head.
Ahead of the match, Celtic manager Ange Postecoglou had urged the club's supporters to show respect.
"I think there's a minute's applause [on Sunday], we will abide by whatever obligations and responsibilities we have as a football club," said Postecoglou.
"We will do that in a respectful manner. We want our supporters to do the same."
UEFA opened disciplinary proceedings against Celtic this week after fans displayed other anti-monarchy banners during Wednesday's Champions League match against Shakhtar Donetsk.
One banner, which read 'F*** the Crown', was unveiled by Celtic supporters, while another referenced Michael Fagan – an intruder who broke into The Queen's Buckingham Palace bedroom in 1982.
Meanwhile, Celtic's Glasgow rivals Rangers will not face any sanctions from UEFA despite defying its instructions not to play the national anthem ahead of their own Champions League match against Napoli on Wednesday.
Rangers played 'God Save The King' after holding a minute's silence, with the club's fans also unveiling a Union Jack tifo at Ibrox featuring a silhouette of the Queen.
Topics: Football, Celtic, Scottish Premiership
Rory O'Callaghan