Neil Warnock has revealed R's midfield lynchpin Ali Faurlin was substituted as a 'precaution' against Ipswich Town on Tuesday night.
The Argentine limped out of the action late on in the first half at Portman Road, as the R's eventually coasted to a 3-0 win.
Warnock told www.qpr.co.uk: "Ali's groin was tight.
"We're not going to take any risks at this stage of the season, because we've got so many games coming up."
The R's gaffer also revealed that Bradley Orr is set to miss Saturday's trip to Leicester City with a calf injury, commenting: "Bradley damaged his calf against Boro' on Saturday.
"He'll probably be touch-and-go for Doncaster, but then he should be okay."
Despite Orr's injury, Warnock was full of praise for loan debutant Kyle Walker, following his move from Spurs.
"I made a decision to ask Harry (Redknapp) for a favour over the weekend and he came up trumps with Kyle," he said.
"Kyle only came in on Monday morning, but Sheffield lads settle in quickly(!) and he did very well."
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