JUSTIN Hoyte could make his first league start for Millwall since Boxing Day last year.
With Nicky Bailey ruled out through injury, Jimmy Abdou is expected to return to midfield and vacate the right-back berth for Hoyte.
But manager Ian Holloway could also change his formation and start with three at the back.
If Holloway sticks with four in defence, he could deploy a midfield diamond and play with two strikers – like he did against Southampton in the league cup.
That would leave the likes of Ricardo Fuller, Mathias Ranegie, Lee Gregory and Magaye Gueye competing to play up front.
Lee Martin and Carlos Edwards (both knee) are sidelined. Angel Martin has a torn calf.
Birmingham will be without USA international Jonathan Spector, who has a thigh strain.
Neal Eardley (knee), Gavin Gunning (knee), Matt Green (knee) and Lee Novak (knee) are all out.