Brendan Rodgers hopes that UEFA don't impose a ban on away fans attending Celtic's next trip in Europe.
However, the Northern Irishman admits the situation looks to be 'serious'.
UEFA have hit the Scottish Premiership champions with a notice of complaint following their midweek Champions League match against Aston Villa.
That follows from a smoke bomb being thrown onto the pitch from the away end at Villa Park following Adam Idah's second goal on Wednesday night.
UEFA issued a stern warning to the club after pyrotechnics were used by Celtic fans in Dortmund back in October.
Celtic were fined €20,000 and were handed a suspended one-match ban over the possibility of away supporters being locked out should a similar incident occur in the next two years.
Now, while a final decision has yet to be made by UEFA, it seems that situation could become a reality ahead of next month's mouth-watering play-off tie against Bayern Munich.
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"Well, I'd be bitterly disappointed for every genuine Celtic supporter," Rodgers told the media. "Clearly, that's not decided yet, but it's serious enough for the club to put that statement out.
"For those Celtic supporters that genuinely bonded with their club, their team, and have travelled near and far over many, many years, to even be at the risk of not going, tells you the culmination of events that have taken place up until that point.
"That's where I sit at the minute. I really hope that it's not the case for the genuine supporters who love the club and have gone to games all over the world. Let's see what comes from it.
"I just find it hard to fathom in terms of... the difference between a genuine Celtic supporter and someone who's there just for a different reason."
A club statement on the matter reads: "As a result of the use of pyrotechnics during our match against Borussia Dortmund last year, Celtic Football Club was sanctioned by the UEFA Control, Ethics and Disciplinary Body.
"The decision meant that, not only did the Club receive a fine of €20,000, but also that, if such behaviour was repeated at a match in the next two years, the Club would be prevented from selling tickets to supporters for one away match in UEFA club competitions.
"Unfortunately, the club has received a further disciplinary notice from UEFA following the match against Aston Villa FC on Wednesday evening.
"The Club will obviously make robust representations to UEFA and will make every effort to ensure that our fans can attend our next UEFA Champions League match. However, clearly, there is a risk that supporters may not be able to attend.
"In light of this situation, it is incumbent on the club to make supporters aware of this risk, when considering making arrangements for travel, until further information is provided by UEFA."
