Darby arrived at the club from Liverpool on loan for the rest of the season on Thursday and could go straight into the starting XI at right-back should Kevin Amankwaah not shake off a strain sustained in the game against MK Dons last time out.
Captain Gordon Greer is struggling with an ankle knock and may miss out, while long-term absentee Alan O'Brien is still weeks away from a return with his hamstring injury.
Callum Kennedy (pelvis) and Kurt Hammonds (knee) are also long-term casualties for sixth-placed Town, who are looking to bounce back from two consecutive league defeats.
