QPR expect to receive news on injuries suffered by Jake Bidwell and Jordan Cousins within the next 24 hours.
Both players went off during Saturday’s 1-1 draw against Derby at Loftus Road.
Bidwell was led away after half an hour of the game with what appeared to be a shoulder problem, although Steve McClaren suggested the injury was to the defender’s collarbone.
“He’s gone to hospital. It didn’t look good. Shoulder or collarbone – we don’t quite know yet,” said McClaren.
Cousins, meanwhile, limped off midway through the second half of Saturday’s match.
QPR’s full-back worries
Bidwell being sidelined for a lengthy spell would be a significant blow for Rangers, who are not heavily stocked with other options at left-back.
They are already without right-back Darnell Furlong, with short-term signing Angel Rangel having been signed as cover.
Veteran defender Rangel moved across from the right to play as a makeshift left-back after Bidwell went off against Derby.
Bidwell is no stranger to shoulder injuries – he spent two months on the sidelines in 2016 after suffering a dislocated shoulder against Burton Albion.