Hereford trio Michael Townsend, Dan Connor and Ryan Valentine are all in the treatment room ahead of the visit of local rivals Oxford.
Defender Townsend (knock) and goalkeeper Connor (hip) both missed last weekend`s disappointing 3-0 defeat at Burton and are likely to sit out once again.
Full-back Valentine did feature at the Pirelli Stadium but has been forced to miss training this week due to a sickness bug and is facing a race against time to prove his fitness.
Deadline-day signing Dominic Werling could be handed a start in defence having only made the bench against Albion, while manager Simon Davey must also decide whether to keep faith with Amadou Rabihou and Mathieu Manset in attack with the goal-shy Bulls having scored just once this season.
It remains to be seen which formation Davey will opt to go with as he looks to end a run of three successive defeats, having used both 3-5-2 and 4-4-2 at Burton but having favoured a 4-3-3 system for the majority of this term.
Central defender Jake Wright has been passed fit for Oxford.
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.
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