QPR captain Geoff Cameron missed the defeat against Brentford because of a fatigue-related injury.
The veteran midfielder struggled after taking a knock during the second half of Tuesday’s win against Rotherham.
He subsequently sat out the game against the Bees but is expected to return to the squad against Bristol City.
Boss Mark Warburton explained: “Geoff was injured – again fatigue.
“Every team’s facing the same problem, with players picking up soft-tissue injuries through fatigue through being asked to play so many games.”
Warburton believes QPR’s recent performances have shown they can be a force to be reckoned with in the Championship.
Rangers impressed during a recent 1-1 draw with Watford and beat Rotherham before a controversial 2-1 defeat in the west London derby.
Warburton was furious that Bees defender Mads Sorensen was not sent off following a foul near the edge of the penalty area on Lyndon Dykes, who would have through on goal.
It was a key moment in a tight game settled by Ivan Toney’s second-half header.
Warburton said his side were “very hard done by” but should believe they can match anyone in the division.
“We showed it,” said Rangers’ former Brentford boss.
“We also played very well against Watford, conceding a second-minute goal and then dominated that game and should have won comfortably against a very good team who are one of the favourites to go up, as are Brentford.
“We’ve come here and shown what we can do. We haven’t come here and tried to hang on – we played football and you’ve seen what we can do.
“We’re a young side, developing, have got some new faces, and they deserve enormous credit.
“We’ve had a draw and a win and should have come away tonight with at least a point.”