Centre-half Leon Cort and full-back Lawrie Wilson are the latest additions to the casualty list.
Cort suffered a hamstring injury during the 4-3 win over Watford on New Year's Day and Wilson came off with a broken nose.
Striker Danny Haynes is out with a hamstring problem and defender Rhoys Wiggins (foot) is still sidelined along with midfielders Andy Hughes (Achilles) and Ade Azeez (hamstring).
In addition loanees Dan Seabourne, Rob Hulse and Emmanuel Frimpong have now returned to their parent clubs.
But centre-half Michael Morrison returns to the squad after missing out at Vicarage Road through suspension after he was sent off against Derby.