Lyndon Dykes and keeper Seny Dieng are among QPR players who will be assessed ahead of Friday’s Championship game against Luton.
Andre Gray, meanwhile, is still struggling with a knee knock and has been ruled out.
Dykes was away with Scotland during the recent international break but unavailable for selection because of the ankle injury he picked up against Nottingham Forest last month.
The striker did play in Rangers’ win at Cardiff and the 1-1 draw with Blackpool before jetting off to Moldova with the Scottish squad, but will need to pass a late fitness test to determine his availability for the visit of the Hatters.
“We’ve got to see how he is. He was in with the medical boys yesterday and we’ll see how he is,” manager Mark Warburton said.
“You look at the amount of football Lyndon has played, he never gets a break, he goes away (with Scotland) and all credit to him, he has established himself as Scotland’s number nine and is a consistent goalscorer for his country and done supremely well.
“But it just means he never gets a break, so we have to look after him.”
Ilias Chair returned to London late on Wednesday afternoon from Rabat, where he played 80 minutes in Morocco’s 3-0 win over Guinea, and his fitness will be checked by the club’s medical staff along with Moses Odubajo, who is nursing a hamstring problem.
Dieng has finished his isolation period following Covid-19 but has yet to train with the team this week.
Warburton said: “We’ve got Moses and Andre being checked, there is Seny who has been isolating due to Covid.
“There are a lot of questions and I hope to have some answers later on Thursday before I can think about naming a team.”
Lee Wallace played 60 minutes for the Under-23s last week and is set to be involved for the first time since August, when he suffered a serious hamstring injury in the 3-2 win at Middlesbrough.