The disruption was also felt at the Purple Cat Cafe.
The cafe is home to over 30 rescue cats, which visitors can mingle with while they enjoy their refreshments.
But on Saturday the disturbance in the area scared many of the cats.
“Our cats stay in here 24 hours, they stay downstairs at night time but they come upstairs in the morning and while they were up we had Celtic fans banging on the windows,” said supervisor Shiloh MacDonald.
She continued: “They’re used to loud noises being next to the Royal Infirmary but they’re not used to fireworks and flares going off.
Many customers cancelled their visits because of the football fans.
“We had sessions to run with customers but it is quite disruptive to the session when people are just trying to have a nice relaxing day with the cats and a coffee and there’s a rowdy party going on outside.”