Australian international Kewell is recovering from surgery on his groin .
Australian international Kewell has played just 46 minutes of football this season but Benitez said he still believed the player could put in a full 90 minutes if necessary .
Australian international Kewell is recovering from surgery on his groin and has played just 46 minutes of football this season but Benitez said he still believed the player could put in a full 90 minutes if necessary .