Derry City fan Malcolm McCausland also witnessed the incident.
“Shortly after Derry scored, we witnessed an invasion of the Derry stand,” he told BBC Radio Foyle’s North West Today programme.
“I saw sights that I have never seen at a football match before.”
He said security at Brandywell – where there is normally not a police presence – would have to be reviewed in light of the trouble.
“A bunch of men and women in hi-vis jackets are not equipped to deal with this,” he said.
In a statement, Derry City Football Club said it “unequivocally condemns the violence witnessed at tonight’s match”.
“The club is working closely with UEFA, the PSNI, CSKA Sofia and our security partners to establish the full facts surrounding the incidents,” it added.
The MP for the area Colum Eastwood described the incident as “disgraceful” and said he would “demand answers” from the police about how it was handled.
The BBC has approached CSKA Sofia for comment.
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