The defender was dismissed after just 11 minutes of the Eagles' 1-1 draw with Huddersfield on Saturday and starts a three-match ban.
Danny Gabbidon could be handed his full debut in Delaney's absence following two substitute outings.
Midfielder Jonny Williams is looking to be involved after returning from a groin problem and is targeting a place on the bench.
Skipper Paddy McCarthy remains sidelined with the groin injury that has kept him out of action for the whole season.
Ian Holloway's side go into the game four points behind their opponents and are looking for a repeat outcome of September's meeting between the clubs, as Glenn Murray's second-half hat-trick saw Palace come from two goals down to win 3-2.