It was a Rangers performance so poor it had fans leaving Ibrox before half-time - and questions being asked of Russell Martin's future at full-time. Martin has only been in charge since June and the season only began in earnest a fortnight ago, but the new manager is already under serious pressure. The 3-1 humbling by Club Brugge does not just leave Rangers' Champions League hopes hanging by a thread, it has also cast doubt on Martin's future as manager.