Both players should be eligible to play and while Davies is likely to be on the bench manager Alex McLeish will take a decision on ex-Newcastle striker Martins' fitness nearer the match.
Back again: Martins (right) is for another crack at the Premier League
Blues have no other new injury worries, other than long term absentees James McFadden (knee) and Scott Dann (hamstring).
Team (from): Carr, Murphy, Bowyer, Johnson, Ridgewell, Larsson, Gardner, Hleb, Jerome, Ferguson, Doyle, Fahey, Zigic, Parnaby, Beausejour, O'Shea, Foster, Jiranek, Phillips, Martins, Davies, Derbyshire, Mutch.
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Explore more:People: James McFadden, Obafemi Martins, Scott Dann, Alex McLeish Places: Birmingham, Newcastle