The Eagles are currently appealing a UEFA decision that demoted them from the Europa League.
The decision was made after a multi-club ruling, which saw Palace's former shareholder John Textor's Lyon qualify for the Europa League instead.
Lyon secured their spot due to a higher ranking in Ligue 1.
Crystal Palace will host the first leg of their playoff tie at Selhurst Park on 21 August, with the second leg scheduled for 28 August.