The Blues were ousted 1-0 on Saturday by rock-bottom Ipswich Town in Mick McCarthy's first game in charge of the Tractor Boys.
Clark could restore Nikola Zigic to the starting lineup after the Croatian made a big difference coming on against Ipswich, with either Leroy Lita or Marlon King dropping to the bench.
Derek McInnes's Robins will be buoyed by the fact that Birmingham have not win in five at home.
Possible starting lineups:
Birmingham: Butland; Robinson, Davies, Caldwell, Murphy; Redmond, Mullins, Morrison, Elliott; Zigic, King
Bristol: Gerken; Foster, Fontaine, McManus, Briggs; Skuse, Kilkenny, Pearson, Adomah; Stead, Baldock
Sports Mole says: 3-1