Celtic legend Billy McNeill lashed out at trouble-making supporters on Tuesday after the club was left facing fresh disciplinary action from UEFA.
European football's governing body opened proceedings against the Glasgow giants for the second time in two months after supporters displayed an offensive banner and let off a firework during a Europa League game in Udinese last week.
Former skipper and manager McNeill on Tuesday voiced his dismay at the unruly Hoops fans who he said were tarnishing the club's reputation in Europe.
"This has left me hurt and disappointed," McNeill told The Scottish Sun. "For generations, Celtic fans have had a great record in Europe.
"Now that record is in danger of being wrecked by these people - I struggle to call them fans.
"If these people have ruined everything for everyone then the club has to cut them out and get them away. Because God knows what will happen to the club if it's allowed to continue."
A section of Celtic's travelling support in Italy held aloft a two-part banner which insulted UEFA, days after the club were fined about Â£12,700 for "illicit chanting" involving pro-IRA songs at a Europa League game.
Several flares were also let off and one was thrown on to the pitch-side track as Celtic crashed out of the tournament following the 1-1 draw against Udinese.