Leeds are without Eirik Bakke again due to a thigh injury, so Stephen McPhail will retain his place.
Gray has added young Irish midfielder Paul Keegan to the squad, the 20-year-old scored a brilliant goal for the reserves in midweek.
Birmingham's Damien Johnson (ankle), Matthew Upson (knee) and Mikael Forssell (back) look set to return from injury.
Defender Olivier Tebily (back) is available but midfielder Robbie Savage is again missing while completing a two-match ban for his 10 bookings this term
Birmingham (from): Maik Taylor, Martin Taylor, Tebily, Cunningham, Upson, Grainger, Johnson, Clemence, Hughes, Lazaridis, Forssell, Morrison, John, Bennett, Cisse, Carter, Barrowman.
Leeds (from): Robinson, Kelly, Harte, Radebe, Camara, Duberry, Viduka, Sakho, Pennant, McPhail, Keegan, Smith, Seth Johnson, Matteo, Caldwell, Olembe, Lennon, Domi, Kilgallon, Milner, Simon Johnson, Carson.