This time it's Patrick Agyemang. The striker has a thigh muscle problem that he picked up in training.
Physio Paul Hunter told Rangers website: "In terms of recovery time we are talking months rather than weeks.
"The surgeon is happy with the early progress and we're hoping it will be around three months and realistically the earliest he'll be back is April."
The news is a further blow to QPR's play-off hopes following Tuesday's news that club captain Martin Rowlands is set to miss the rest of the season with a knee injury.