Crystal Palace have lodged an appeal with the Court of Arbitration for Sport (CAS) following their exclusion from the UEFA Europa League and subsequent placement in the third-tier UEFA Conference League.

The London club, last season’s FA Cup winners, were penalized under UEFA’s regulations concerning multi-club ownership. UEFA ruled that as of March 1, American investor John Textor held significant control or influence over both Crystal Palace and French side Olympique Lyonnais.

Under UEFA rules, clubs under shared ownership are prohibited from participating in the same European competition. As Lyon finished higher in their domestic league than Palace, they were awarded the Europa League spot, with Palace being relegated to the Conference League.

If UEFA’s decision stands, Nottingham Forest—who finished seventh in the Premier League—are expected to move into Palace’s Europa League slot.

On Tuesday, CAS confirmed it had received an appeal from Palace and would deliver a verdict no later than August 11. The club is seeking reinstatement into the Europa League, potentially at the expense of either Lyon or Forest.

While John Textor has agreed to sell his shares in Crystal Palace to New York Jets owner Woody Johnson, the transaction was not finalized in time to meet UEFA’s compliance requirements.