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Fans could end up being banned from the next 2 European games under action from UEFA over claims of sectarian chanting.
The club' sconfirmed the governing body had opened a case against them over their fans behaviour at the Europa League game against PSV Eindhoven on March 17.
Debt-hit Rangers have been told they face a heavy fine and a two-match ban on home supporters in European competition next season.
Rangers chief executive Martin Bain was ``astounded'' after UEFA added the case to an identical charge over the first leg.
Bain disclosed that both charges had been prompted by evidence from the fan-led Football Against Racism in Europe organisation despite no problems being flagged up by UEFA's official delegate.
And Bain pledged the club would fight the charges ``very, very vigorously''.
``We have never said that sectarian singing is not a problem but this now has all the hallmarks of a deliberate and targeted campaign against the club,''
``What else are we expected to believe when UEFA officials give us favourable reports at our matches only to indict us later on the evidence of an outside unaccountable body?
``It would appear that yet again UEFA have acted on a report from the FARE organisation when their own match delegate, this time from Northern Ireland, gave us a very favourable report.''
UEFA, whose disciplinary panel will discuss the club's case on April 28, have fined Rangers twice for the same offence in the last five years.
But Rangers argue they could not have done any more to fight sectarianism and last week listed the numerous programmes they have instigated to tackle the issue at a cost of several hundred thousand pounds.
They were recently involved in a summit with Celtic, police and Scottish Government officials along with Scottish Football Association chief executive Stewart Regan.
Regan vowed to continue working with Rangers and Celtic to tackle the problem.