Full-back Richards, who has missed the last two games, will be sidelined for about four weeks, but manager Colin Cooper has no new injury or suspension issues.
Midfielder Andy Monkhouse returned to the starting line-up after suspension last week and struck the equaliser against Coventry in the FA Cup, so he is expected to retain his place in the starting line-up.
Fellow midfielders Jonathan Franks and Antony Sweeney are pushing for recalls, while Cooper is likely to name an unchanged back four.
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- American Football
- Colin Cooper
- Andy Monkhouse