Oran Kearney admitted he was nearly forced to take his St Mirren players off the pitch after a firework was thrown by a Celtic fan.
The pyrotechnic was Celtic fan throws firework that goes off near St Mirren keeper Vaclav Hladky and went off near Saints keeper Vaclav Hladky after Ryan Christie doubled his side's lead in Paisley.
Hladky was unharmed in the incident but the former Coleraine manager was disappointed with the unsavoury scenes as the Celtic fan throws firework that goes off near St Mirren keeper Vaclav Hladky on the night.
He said: "It is crazy to think we might have had to use an outfield player in goal.
"It is mad to think of how that possibly could have ended up.
"You are tempted to walk your team off the pitch.
Celtic fan throws firework that goes off near St Mirren keeper Vaclav Hladky
"We have been beat tonight - the easiest thing for me to do is make a massive meal out of that and deflect away, but it is a huge deal.
"I had a brief chat with (Hladky) but had to rush out to do media stuff.
"We are hopeful that thankfully it hasn't ended up more sinister than it could have.
"I am standing 50 or 60 yards away and it made me jump. So if he is a yard (away) or however close, I dread to think the sound that came off."
Former Northern Ireland captain St Mirren vs Celtic: Oran Kearney's team selection criticised by ex-Northern Ireland captain Stephen Craigan for making wholesale changes to the squad that beat Dundee 2-1 at the weekend.
But Kearney defended his decision and insisted it didn't hurt his side's chances of getting a result against Neil Lennon's men.
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