The Australian was forced off with six minutes remaining of the 1-1 draw with Watford on Saturday and faces a check on his knee injury.
If he is ruled out, England Under-21 international Alex McCarthy - who played almost all of last season on loan at Yeovil - will make his first league start for the club.
Striker Mathieu Manset is a doubt with the calf injury which kept him out at the weekend while defender Alex Pearce is unlikely to return from his thigh problem.
Midfielder Jem Karacan remains out as he completes a three-match ban as Brian McDermott's side look for a first win in seven games.
Source: PA
Source: PA