FA Cup winners Palace have been pushed out of the competition as shareholder John Textor also owns fellow qualifiers Olympique Lyon.
Now seven Liberal Democrat MPs have asked the culture secretary Lisa Nandy to intervene.
Meanwhile, Palace chairman Steve Parish has confirmed the club will appeal to the Court of Arbitration for Sport (Cas) over Uefa's decision.
"We are still fighting," Parish told the The Rest is Football.
"There's an appeal process, so we go to Cas, and we're very hopeful. We think we've got great legal arguments.
"We don't think this is the right decision by any means. We know unequivocally that John didn't have decisive influence over the club.
"We know we proved that beyond all reasonable doubt because it's a fact."
