The 24-year-old has not fully recovered from a minor hamstring injury picked up during their 2-1 defeat to Portsmouth and he will not make the trip.
And while Jon Meades is still sidelined captain Jake Wright will start once more after making his comeback against Northampton following three weeks on the sidelines with an abscess.
The U's go into this weekend's match two points off the top of the Sky Bet League Two table and they head to the Crown Ground having not lost a league match on their travels this season.
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- Jake Wright