On-loan Derby forward Nathan Tyson suffered an ankle injury on his debut against Burnley last weekend and will be out for a month, while last season's top scorer Darius Henderson is in talks over a move to Nottingham Forest.
Martyn Woolford is cup-tied but fellow winger Liam Feeney is fit after a hamstring injury and will be added to the squad.
Former Villa centre-half Shane Lowry misses out against his old club through suspension and full-back Scott Malone is still sidelined with a back injury.
Skipper Paul Robinson is to see a specialist after suffering a setback in his recovery from a groin problem.
