The veteran centre-half missed last Saturday's FA Cup fifth-round win at Luton due to an ankle problem and then sat out the midweek 5-1 drubbing by Peterborough with flu.
A defensive reshuffle is on the cards whether Shittu is fit or not as left-back Shane Lowry was sent off against Posh and starts a three-match ban.
Right-back Adam Smith's place could also be in doubt after he was hauled off at half-time.
Winger Chris Taylor is close to returning after a knee ligament injury but defender Paul Robinson (groin) and on-loan Derby striker Nathan Tyson (ankle) remain on the sidelines.
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