For the hosts, manager Lee Clark may decide to start Nikola Zigic ahead of Matt Green up front, while Shane Ferguson could also begin the match from the left wing after coming on in Saturday's home defeat to Reading.
An encouraging stat for Clark is that Birmingham have not lost against Millwall in their last 10 matches.
Both games between the pair finished as a draw last season, with Marlon King scoring a hat-trick for the Blues at The Den last October.
Possible starting lineups
Birmingham: Randolph; Caddis, Bartley, Burn, Robinson; Burke, Elliott, Adeyemi, Ferguson; Lingard, Zigic
Millwall: Forde; Dunne, Shittu, Robinson, Malone; Abdou, Trotter, Bailey; Woolford, Morison, Waghorn
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