Shamrock Rovers have been hit with a stadium ban for the opening league game of the season.
The Hoops have been ordered to face UCD behind-closed-doors on February 18 as punishment for the firework incident in Waterford on November 5.
Two supporters were arrested at the RSC after one let off a repeater firework, shrapnel from which put spectators and both sets of players in danger
Rovers acknowledged the seriousness of the incident at the time, but an appeal into the severity of the punishment has been rejected by the FAI.
Shamrock Rovers have not commented on the matter and are investigating whether they have other avenues to appeal.
Along with other League of Ireland clubs, Rovers have been fined in the past when fans have used fireworks.
But a stadium ban is a significant blow as Covid-enforced crowd restrictions are set to be lifted by the Government in the weeks ahead.
Shamrock Rovers beat Waterford 3-1 in that game at the RSC.
Immediately after the match, Hoops boss Stephen Bradley had said: “It’s not good enough. There are kids there, there are families there and obviously players and staff. It’s not acceptable.
“It’s not good enough, but I do have to stress that it’s one fan. I’m not making excuses. It’s not acceptable or good enough.
“You could see that from the rest of our fans towards that one individual. They were disgusted with it, like everyone was.
“It’s dangerous stuff. There’s no place for it anywhere, let alone a football ground. I’m not making excuses for it but one idiot caused that mayhem.”
A Shamrock Rovers club statement the day after the match read: “Shamrock Rovers F.C unequivocally condemns the actions of two ‘so called’ supporters...”
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