Skipper Dawson was elbowed in the eye during the midweek defeat at Bournemouth, O'Brien is hoping to overcome a knee injury and Cywka is nursing a calf strain.
Striker Marcus Pedersen remains sidelined due to a nasty cut on his foot that he sustained on recent international duty, but defender Martin Cranie came through unscathed at Bournemouth after returning from a knee injury.
Fellow defender Peter Ramage, on loan from Crystal Palace, is expected to make his home debut for the Reds, while Reuben Noble-Lazarus, Dale Jennings and Jason Scotland are among those pushing for recalls.
- Sports & Recreation
- Marcus Pedersen
- Martin Cranie