Robert Earnshaw could miss the rest of the season with the groin injury he suffered in training last week, Norwich boss Peter Grant has admitted.
The Wales international was ruled out of the 3-1 defeat to Plymouth on Saturday and was then sent to consult a specialist.
He has since undergone surgery and Grant concedes that a return to action before the end of the season is only a best-case scenario.
"Unfortunately this is going to be a case of months rather than weeks for `Earnie'," said Grant.
"He had an operation on Tuesday and the injury is similar to that suffered by Robert Green before the World Cup, where the ligament has come away from the bone.
"I would be delighted if I got him back by the end of April but that depends on how his recovery goes.
"However it could be next season, we'll just have to wait and see. Obviously Earnie is absolutely gutted, as am I."
Earnshaw has scored 18 goals for Norwich this season and his absence will be a massive blow to Grant.