Leaders QPR will be without Matt Connolly for the clash with Bristol City.
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.