Norwich City midfielder Elliott Bennett will be out of the game for several months after a knee operation.
The problem was discovered after City's opening game of the new Premier League season against Everton. Manager Chris Hughton will assess whether to bring in a replacement.
The injury worry was announced on the same day that Hughton presented his latest signing, Swedish international Johan Elmander.
He's joined on a season long loan from Turkish club Galatasary. Elmander hopes his three years in the top flight with Bolton will make a difference at Carrow Road.