Central defender Jake Wright has been passed fit for Oxford's trip to Hereford.
Wright was substituted in United's 4-0 thrashing of Morecambe last weekend after complaining of a stiff back but boss Chris Wilder revealed the former Brighton man was only brought off as a precaution.
Wilder is expected to name an unchanged side after such an impressive performance against the Shrimps, with skipper James Constable partnering recent signing Tom Craddock in attack once again.
Constable scored a hat-trick against Sammy McIlroy's side in what was Oxford's first League Two victory of the season.
Two players who will definitely play no part against the Bulls are Rhys Day and Damian Batt, who are still recovering from knee and ankle problems respectively.