John Eustace says QPR are unsure whether Jake Bidwell, Angel Rangel, Toni Leistner or Grant Hall will be available for Monday’s game at Derby.
All four defenders missed Saturday’s home defeat against Blackburn and caretaker boss Eustace will consult the club’s medical staff before naming his squad for the trip to Pride Park.
“We’ll have to wait and see. We’ll have to ask the medical department,” said Eustace, who spent the final two years of his playing career with Derby.
Rangers will be without Jordan Cousins, who was stretchered off against Blackburn after suffering a knee injury.