Midfielder Thomas (knee) and right-back Willis (knock) did not train on Friday but will be assessed on the morning of the clash at the Banks's Stadium.
Boss Steven Pressley has named an unchanged starting line-up for the last three matches and watched his side follow up four points against Sheffield United and Wolves by inflicting a first defeat of the season on Leyton Orient in midweek. But the Scot may now be forced to change a winning formula.
Right-back Cyrus Christie (ankle) and forward Billy Daniels (hernia) continue to miss out.
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- Steven Pressley
- Sheffield United