Defender Tom Eastman picked up a knock early on in Saturday's 2-1 home defeat to Crewe and was subsequently forced off in the 17th minute.
Meanwhile, left-back Bradley Garmston and striker Freddie Sears (both knee) missed the game altogether and all three will be assessed ahead of the clash at the Ricoh Arena to determine whether they have any chance of being involved.
One player definitely unavailable to boss Joe Dunne is striker Jabo Ibehre as he serves the second game of his three-match suspension.
New boy Michael Smith, who arrived on loan from Charlton on Friday, will be pushing for his full debut having impressed following his introduction from the bench in place of David Wright after just 34 minutes at the weekend due to tactical reasons.
Fellow loan signing Troy Hewitt is also striving to start having made his debut for the U's in the latter stages.
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- Freddie Sears