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Celtic face a wait to find out if their fans will be banned from their next game away from home in the Champions League after a smoke bomb was thrown on to the pitch during Wednesday's game against Aston Villa.
The Scottish champions were handed a suspended ban on selling tickets to away fans after the use of pyrotechnics during their match against Borussia Dortmund in October.
European governing body Uefa is awaiting the details from their match delegate report from Villa Park, but the use of pyrotechnics is likely to be noted.
Uefa is also likely to investigate banners and chanting from the match in Birmingham.
If the incident is in the delegate's report and Celtic are found guilty, the suspended sentence of a one-match ban for their away fans will be automatically imposed.
There could also be further punishment, but that will be determined by Uefa's control, ethics and disciplinary body, with an outcome unlikely until next week.
Celtic manager Brendan Rodgers was asked about the smoke bomb implication after the game but refused to be drawn.
The Scottish champions were already assured of a place in the play-off stage of the new Champions League format before their 4-2 defeat.
Celtic will now face either Real Madrid or Bayern Munich in a two-legged game to determine who progresses to the last 16.