Thirlwell: Set to face Leeds
Former Liverpool trainee Raven serves the final game of his three-match suspension but centre-back Danny Livesey will be available to replace him after serving a one-match ban.
Midfielder and captain Thirlwell could also return to action after missing most of the campaign due to a succession of injuries.
However, the game may come too soon for midfielder Jeff Smith (ankle) while on-loan defender Paul Reid has returned to parent club Barnsley for treatment on an ankle injury.
The 26-year-old, who was in his second spell at Brunton Park, has been restricted to just one appearance since rejoining the Blues in March.