Birmingham striker Clayton Donaldson could return to the squad after three months out with an Achilles injury.
Midfielder Jacques Maghoma may also be included after missing Blues' 1-1 draw at Cardiff City.
Newcastle full-back DeAndre Tedlin will be out for several weeks with a thigh injury, with Vurnon Anita or Jesus Gamez likely to take his place.
Centre-back Ciaran Clark is a doubt for the trip to St Andrews after picking up a knock to his knee.
Newcastle boss Rafael Benitez may have to do without full-back DeAndre Yedlin for five weeks after a thigh injury proved to be more serious than first thought.