Crystal Palace chairman Steve Parish has confirmed his club will appeal to the Court of Arbitration for Sport after being demoted from the Europa League.
Palace qualified for the Europa League with a shock FA Cup final win over Manchester City in May.
But UEFA, European footballs governing body, ruled Palace should drop down to the Conference League over a conflict of interest involving the clubs former director John Textor, who also part-owns French side Lyon.
Textor stepped away from Palace at the start of July, but the ownership issue relates to the end of last season when the south London team secured a maiden European appearance by winning the first major trophy in their history.
UEFAs ruling would mean Nottingham Forest, who finished seventh in the Premier League, take Palaces place in the Europa League, but Parish has signalled his intent to contest the decision.