DJ Campbell has been sent to see a specialist to assess the extent of his foot injury.
The QPR striker, who has been struggling with a viral infection, picked up the problem in a training game on Thursday, which kept him out of this afternoon's clash with Blackburn Rovers.
Campbell has had a frustrating start to life at Loftus Road , making just one start since his summer switch from Blackpool.
The Hammersmith-born hitman is expected be out for at least four weeks, and is another blow for boss Neil Warnock as his side have struggled to find the net in the opening seven games of the season.
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