Dervite serves a one-match ban after he was sent off during last weekend's FA Cup defeat by Huddersfield, and Cort is sidelined by a hamstring injury.
Matt Taylor, who got a rare outing in the cup, is now set to make his first league start of the season at the back alongside Michael Morrison.
Full-back Rhoys Wiggins played for the reserves in midweek after four months out with a foot injury but he will not be rushed back.
Striker Danny Haynes is still missing with a hamstring problem and midfielder Andy Hughes remains sidelined by an Achilles injury.
Goalkeeper Ben Hamer, defender Chris Solly and striker Ricardo Fuller return after being rested on Saturday.