Peter Lawwell has hit out Celtic supporters after UEFA opened disciplinary proceedings relating to 'an incident of a non-sporting nature'.
Hoops fans brandished an illicit banner during Tuesday night's Champions League loss to AC Milan prompting UEFA to investigate the situation which has infuriated chief executive Lawwell who has had to put up with misbehaviour form the Parkhead faithful in the past.
"Last night was nothing more than clear disrespect for the club and our supporters who now face another UEFA charge," a statement from the chief executive read.
"There have now been a number of UEFA charges made against the club during the last three years, relating to behaviour, displays and pyrotechnics - it cannot go on any further.
"Let's be very clear. Following the actions of a small minority, these charges are made against the CLUB. It is the reputation of Celtic, our great club and our great fans which is damaged, while others carry on indulging in such behaviour.
"Regardless of the political views people hold, football stadia, whether it is Celtic Park or anywhere else, should not be used to promote these.
"This is something which all football authorities, including UEFA, have stressed for some time and something well known by all supporters.
"The club don't want it, our manager and our team don't want it, our supporters don't want it and the football authorities don't want it - it has to stop.
"Celtic is a world-class football club and rightly proud of its wonderful reputation in the game. This is a reputation hard-earned by our supporters over many years. We cannot and will not allow this reputation to be tarnished any further."
