The 31-year-old was forced off in the first half of Saturday’s fierce London derby with scans today revealing the extent of the England international’s problem.
QPR’s official Twitter account stated: “Andy Johnson suffered an anterior cruciate ligament injury against Chelsea and is likely to be side-lined for the majority of the season.”
Johnson was one of many summer additions at Loftus Road, arriving on a free transfer from Fulham and was making only his third appearance for the R’s.
Speaking on the official club website after the game, manager Mark Hughes had stated his hopes that the injury wasn’t too serious, “AJ felt something in his knee. We hope he’s going to be ok, but it’s a little bit of a worry.
“You need players like AJ in the squad because they give so much,” Hughes said.