Midfielder Austin is nursing a slight knee problem and defender Drury has been struggling with his back, but both players are expected to be in contention for the last fixture of the season at Elland Road.
Skipper Lee Peltier played the final half-an-hour in last week's defeat at Birmingham following a sprained ankle and could return to the starting line-up.
McDermott must decide whether to retain Jason Pearce and Tom Lees in central defence or recall Peltier, while striker Steve Morison is pushing for a recall.
Midfielder David Norris is sidelined following knee surgery and forward Davide Somma suffered another setback last week and required an operation to resolve a cartilage problem.
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