O'Connor has undergone surgery on a hip problem and will be out of action for several months while Tainio will require a knee operation which will also sideline him for a lengthy period.
Out of action: O'Connor (left) set to watch the game on television
Club captain Damien Johnson is available after a hamstring injury but is likely to be on the substitutes' bench after the loaning out of Jordon Mutch to Hereford.
Provisional squad: Hart, Carr, R Johnson, Dann, Ridgewell, Queudrue, Larsson, Bowyer, Ferguson, McFadden, Jerome, Benitez, Maik Taylor, Phillips, Fahey, McSheffrey, Carsley, Vignal, D Johnson.
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