Rangers have received a second UEFA disciplinary charged for alleged sectarian chanting from supporters and now face the prospect of playing two European home games behind closed doors.
Martin Bain, chief executive for the Scottish club, said he was "astounded'' by the case, which stems from their Europa League second leg match against PSV Eindhoven.
Rangers already face the prospect of action in the wake of their first leg match against the Dutch team.
The Scottish champions revealed it was the Football Against Racism in Europe (FARE) organisation that raised the issue rather than UEFA's match delegate, who was from Northern Ireland.
"We are absolutely astounded by this latest development and will defend our club's position very, very vigorously," Bains told the club's official website.
"We are still in the process of preparing our submission on the away game and to be confronted with this now seems chaotic to say the least. 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?''
FARE is a fan's organisation aimed at tackling discrimination in European football'.
"We could not have done more to eradicate sectarian behaviour,'' continued Bain. "We will be seeking urgent meetings with UEFA at the highest level to address these issues.
"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.''
Rangers have been reprimanded for this offense in the past, which UEFA say could lead to stricter sanctions.
The Glasgow-based team were hit with an £8,280 fine for 'improper conduct from fans' during a UEFA Cup game away at Osasuna in 2007.
They were also fined £13,300 for discriminatory chanting by supporters and £9,000 after their fans attacked the Villarreal team bus in 2006.
The case for the first leg will be heard in Nyon on April 28.