Scowcroft: Pulled up on Saturday
Scowcroft came off the bench during Saturday's 2-1 first-leg defeat following a month out with a hamstring injury, but lasted just six minutes before pulling up with a recurrence of the problem and had to be stretchered off.
Defender Matt Lawrence could return to the starting line-up having come through a substitute appearance on Saturday just a fortnight after undergoing hernia surgery.
Paul Ifill and Sean Scannell are also pushing for starts should boss Neil Warnock make changes following the bruising encounter at Selhurst Park, but fellow midfielder Neil Danns is still out with a groin injury.