The duo would have missed Tuesday night's trip to QPR but the match was called off, so they have had an extra few days to recover but remain doubtful.
Palace can welcome back centre-half Paddy McCarthy, who sat out the 4-0 home defeat by Scunthorpe through suspension.
Veteran defender Matt Lawrence is unlikely to make the squad having been placed on the transfer list in the wake of Saturday's drubbing, while strikers Stern John (elbow) and Calvin Andrew (knee) are still missing.
Meanwhile, young striker Matthew Wright has joined Ryman Premier outfit Maidstone United on loan.
Wright, who arrived at Palace in the summer as a free agent and signed a one-year deal, has agreed a one-month loan switch and goes straight into the squad for Maidstone's away fixture at Boreham Wood.
Eagles boss Neil Warnock told the club's official website: "This is a good opportunity for Matthew to get some matches under his belt at a good level."