Striker Benyon suffered concussion and some bruising to the side of his brain after being knocked out in the Capital One Cup defeat atSwindon. And, having missed the draw at Morecambe, he will also sit out the clash with Chris Wilder's men.
Defender Tonge is suspended after seeing red with four minutes to go last weekend while Martin Rice is expected to continue in goal.
Fellow goalkeeper Michael Poke has resumed training after his thigh injury but was not risked in Tuesday's friendly at Cheltenham and is unlikely to be involved against the U's.
- Sports & Recreation