Swansea defender Richards joined the Terriers last week on a loan deal until January, but missed Saturday's goalless draw with Doncaster due to outstanding paperwork.
Calum Woods made his first start of the season at the weekend and is expected to continue should Richards remain sidelined, while striker Jon Stead is pushing for his first start of the season after an impressive second-half showing against Doncaster.
Manager Mark Robins has no new injury or suspension problems, but midfielders Keith Southern (calf) and Anton Robinson (knee) are still out.
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- Calum Woods