Barry Robson (suspected broken ribs) is unlikely to feature in Monday's play-off semi-final second-leg clash at Huish Park.
The Scottish international was taken to hospital on Friday night after an early clash with Jamie McAllister left the midfielder unable to continue.
His replacement and subsequent match-winner Callum McFadzean is likely to deputise in Somerset as United look to secure a second successive play-off final appearance at Wembley.
Tony McMahon (Achilles) is another struggling to be fit, with Darryl Westlake expected to retain his place at right-back after impressing in the first-leg victory over the Glovers.
Ryan Flynn didn't feature on Friday, but could come into contention for a place in the squad for the return leg, if he can prove his fitness over the weekend.