Palace will face Watford in the Championship play-off semi-finals, after Sunday's 1-0 defeat at Sheffield United.
That loss sealed a sixth place finish for the Eagles, while a point at home for Watford was enough to ensure they finish third.
The first leg will be played at Selhurst Park on Saturday 6th May, with a 12.15pm kick-off. The return match takes place at Vicarage Road on Tuesday 9th May, with a 7.45 kick-off.
Leeds will play Preston in the other semi-final, with the first leg played at Elland Road on Friday 5th May.