Crystal Palace have submitted an appeal to the Court of Arbitration for Sport (CAS) over their demotion from the Europa League to the Conference League.
The Eagles had looked to be participating in the second tier of European competition after beating Manchester City in the FA Cup final in May to win their first-ever major trophy.
Their bid to overturn the decision comes two weeks after they were barred from competing in the Europa League due to rules on multi-club ownership, with American businessman John Textor also being the majority owner of Lyon.