Manchester City legend Colin Bell has urged fans to stop "degrading'' the club by singing songs about the Munich air disaster, which claimed the lives of seven Manchester United players in 1958.
City's 1-0 win at Blackburn on Monday was marred by chants about the tragedy and the club, who have previously taken out banning orders against supporters caught on camera making aeroplane gestures, are holding a series of behind-the-scenes meetings to determine an appropriate response to Monday's repeated chants.
But Bell believes it is time for the fans themselves to realise enough is enough.
"They are not true City supporters. Football is a sport at the end of the day and they are chanting about people's lives,'' he told the Manchester Evening News.
"It's gone on long enough and I appeal to them to stop. It's sad and I think it is truly out of order.
"I played for City and now consider myself a supporter of the club and these chants are degrading the club. I don't like it one little bit.''
The Munich tragedy united the city of Manchester in grief at the time and former City goalkeeper Frank Swift was among the 23 people who perished.
In February 2008, the Manchester derby between the sides was used to mark the 50th anniversary of the disaster - with both sets of players wearing traditional kits and both sets of supporters immaculately observing a minute's silence in honour of those who lost their lives.