Leaders QPR will be without Matt Connolly.
The centre-half is suspended after he was sent off during Saturday's 1-0 defeat at Norwich so Fitz Hall or Bradley Orr will come into the back four.
Midfielder Tommy Smith should return to the side after he missed out at Carrow Road under the terms of his loan deal, with Leon Clarke likely to make way.
Norway international Petter Vaagen Moen could also be added to the squad after joining from SK Brann.
Defender Peter Ramage and midfielders Akos Buszaky and Lee Cook are still on the sidelines with knee injuries.
Neil Warnock's side remain four points clear at the top despite Saturday's setback.
Cole Skuse has added to Bristol City's injury problems ahead of the trip to Loftus Road.
The midfielder was forced off early in the second half of the home victory over Cardiff and is unlikely to be included in the squad which travels to west London.
Boss Keith Millen still has defensive problems with Liam Fontaine (ankle) and Jamie McAllister (calf) out along with last season's top goalscorer Nicky Maynard (knee).
But captain Louis Carey could be in line for a place in the squad following illness and a torn calf muscle.
Damion Stewart, Christian Ribeiro, David Clarkson and Danny Haynes are options for Millen if he wants to freshen up his starting line-up.