QPR face being without goalkeeper Seny Dieng for even longer than initially feared.
Manager Mark Warburton revealed at the weekend that Dieng is likely to be out for at least a month.
But Dr Imtiaz Ahmad has indicated that it will be that long before the club even have an understanding of when Dieng might return.
The Senegal international suffered a thigh injury during the recent defeat at Blackburn.
Dr Ahmad, Rangers’ head of medical, told the club website: “Seny sustained a quadriceps injury in the first half at Ewood Park.
“Unfortunately, subsequent scans have confirmed this and he will need a four-week period of rehabilitation before we are in a position to estimate his return.”
Dieng’s absence means David Marshall is set for an extended run in the side.
Veteran keeper Marshall, who will be with the R’s until the end of the season, was signed as cover while Dieng was at the Africa Cup of Nations.
Young keeper Joe Walsh is also out, with a hand injury, so Murphy Mahoney, 20, was on the substitutes’ bench for Saturday’s defeat against Cardiff.