The duo, who have been sidelined with knee injuries, passed fitness tests ahead of kickoff, but Mark Duffy misses out with a calf strain.
Winger Demarai Gray has overcome a knock to make the starting XI, lining up in the Blues' 4-2-3-1 formation.
Former Everton striker Jermaine Beckford will spearhead the Trotters attack.
Birmingham: Randolph, Caddis, Edgar, Robinson, Grounds, Davis, Gleeson, Arthur, Gray, Cotterill, Donaldson
Bolton Lonergan, McNaughton, Mills, Dervite, Moxey, Spearing, Feeney, Danns, Pratley, Chung-Yong, Beckford