Brendan Rodgers has attacked Celtic followers whose shameful pyro mischief left the club fearing that they do not have fans to support them against Bayern Munich in Germany.
And he says that the last disciplinary warning of the UEFA Club should be a line of line for those who continue to ignore all warnings.
After Flares faced Borussia Dortmund previously in the champions League campaign, the Parkhead Club was fined with £ 17,000 and delivered a suspended prohibition of a game of selling tickets. That prohibition would come into play if there was a repetition in the next two years.
With a smoke bomb launched to the field during the 4-2 defeat on Wednesday in Aston Villa, Celtic has received an additional disciplinary notice of the governing body.
While the result is not yet known, the club has warned fans not to make travel arrangements.
Rodgers hopes that the prohibition of fans outside the second stage of the Play-Off on February 18 can be avoided.
Celtic supporters showed a smoke bomb to the field in Villa Park on Wednesday night
Brendan Rodgers hopes that the prohibition of Celtic fans in Munich can be avoided
Celtic received a suspended prohibition from a game to fans from outside after they let go of Dortmund
However, he said: 'Clearly, that has not yet been decided, but it is serious enough for the club to publish that statement.
'For those Celtic supporters who really join with their team and have traveled, close and far, for many years, even being at risk of not going tells you the culmination of the events that have taken us to that point.
'We would never want to reach a point where we enter a game of such magnitude and we cannot take our support base or have the opportunity for our followers to come. I hope I don't do it, but, if something like that is needed, then you have to change.
“The football club cannot continue paying hundreds of thousands of pounds in fines.”
When asked if he was hope that the ban could be avoided, Rodgers added: “I think the club will always fight for our followers, that is what they will do.”
'It has been a catalog of events. It is not just that, putting yourself in that position where it is in balance if you are going to be able to see your team or not.
'We have the opportunity to change it, and not only accept it, because it is not acceptable. Our followers are incredible, and we want to keep it that way.
In terms of tie, Rodgers is enjoying the possibility of facing the leaders of the Bundesliga and six times European champions.
He added: 'It's bright. We have earned the Play-Off stage. The players have been outstanding in the eight games and that qualifies us to play one of these best teams. ''
Rodgers is encouraged by the resilience that his players showed in the six games that followed his last trip to Germany: the 7-1 defeat against Dortmund in October.
“The key message to me this season, and what we wanted to see, was progress,” he added.
'There is no doubt that the team has progressed during the competition.
'He was very proud of the team the other night, because what we clearly showed against Aston Villa was that our spirit was simply broken.
“Our only disappointment was that we didn't have our team (complete) there to really affect the second half of the game.”
Rodgers confirmed that a January movement for Kieran Tierney is now unlikely, since Celtic and Arsenal so far cannot agree on an agreement that would see him return to Glasgow before his agreed summer movement.
When asked if there had been a change in the circumstances, he replied: 'Yes. I will not talk more about that. Kieran, for the summer, will be a Celtic player. And that's all. And if he is here later in the month, you will know.
With Olympiakos in a loan agreement for Luis Palma, Rodgers hopes there are additions to his team before the window closes on Monday.
Brondby striker Mathias Kvistgaarden is a main objective, as is the end of Sarpsborg Sondre Orjaeter.
“We hope to improve the team, that's key to us,” Rodgers added.
Cameron Carter-Vickers is ready to return against Motherwell on Sunday in a match that should see the patron Callum McGregor make its Celtic appearance 500.
“He tells you absolutely everything about his professionalism, his commitment, his quality and his example that he establishes every day of his life,” Rodgers said.