Pittman sustained an injury in a run-out for the reserves in midweek which has now been diagnosed as a strained muscle in his back.
Fellow forward Ben Strevens missed the 3-0 win at Morecambe last weekend with a throat infection but is fit and healthy again and will be in the squad.
Midfielder Matt Bloomfield could miss the next three weeks after he suffered a groin injury which will need surgery.
Left-back Andy Sandell made his return from a knee problem in the reserves last week but is not yet match fit.
Midfielder Stuart Lewis has been ruled out for up to three weeks with ankle ligament damage.
Source: PA
Source: PA