Skipper Bennett is still struggling with the groin injury he suffered in the league win over the Canaries a fortnight ago, and left-back Dickson sat out the weekend draw against Oldham with a knee problem.
Bristol City loanee James Wilson is deputising for Bennett at centre-half, while Sam Wood moved to full-back to replace Dickson on Saturday.
But boss Andy Scott may give Karleigh Osborne or Leon Legge - who has yet to make his debut since a summer move from Tonbridge - run-outs in the competition.
Strikers Ben Strevens (broken leg) and Charlie MacDonald (shoulder) are still missing.
