Rangers used to pride themselves on never having sacked a manager for most of their ilustrious 150 years as a football club. With eight in the last 10 years, it is clear that the Ibrox hot-seat has lacked the stability of previous decades and that the door to the gaffer’s office has been a revolving one. What doesn’t help Philippe Clement as the current incumbent as manager is the instability off the pitch with four key roles all absent and needing to be addressed by John Gilligan. READ MORE: The eight games Rangers play straight after each Europa League league phase clashGiovanni van Bronckho…