Murphy sustained a foot/ankle injury in the Capital One Cup defeat at Leyton Orient and did not train before playing in last Sunday's thrilling 5-4 victory over Bristol City.
He has again struggled to train this week and will be checked over as late as possible before the game.
Barton, meanwhile, withdrew from training with a slight knee problem on Thursday but it is hoped he will be okay for the weekend as captain Carl Baker serves the second game of his three-match suspension.
- Sports & Recreation
- Leyton Orient