The French striker will definately not play in Blues' next two games the first of which is at Leicester on Saturday and he is suspended for the game after that against Middlesbrough at St. Andrew's on December 20th after being sent-off in last weekends home drubbing to Blackburn.
"He doesn't feel confident that the knee that was operated on two or three months ago is right," said Blues boss Steve Bruce.
"He feels he's not 100% fit and is carrying his knee injury."
Dugarry is to re-visit the surgeon who operated on his knee back in August for further advice on the injury.