Shrewsbury manager Graham Turner says the injury to striker Tom Bradshaw in their recent 2-0 win over Wolves is potentially long-term.
Bradshaw was substituted midway through last week's game at Greenhous Meadow after taking a knock when challenging for the ball with Wolves' Danny Batth.
Turner told the club's official website: "We are still waiting for the scan results so don't fully know the extent of the problem.
"Tom has been over the hospital and we are now awaiting the specialist's report from that.
"It looks like it could be cruciate ligaments and whether he's just tweaked it or it's something more serious remains to be seen.
"At this stage the physio doesn't think that it is too serious and if that is the case then Tom will be missing for several weeks but not for a long time if it was a tear."