"We're hopeful we'll have Jermaine back, but we'll see," Grayson told the club's official website
"He's just tight, but another couple of days or so and he should be fine. If not, we won't be risking him."
Defender Patrick Kisnorbo is also a doubt with the ankle injury that has kept him out of the last four matches.
However Neil Kilkenny came off the bench against Carlisle following injury and is in contention once again.