They say you should never go back, and a return to his old employers for the former Rangers player-turned-coach would certainly be fraught with potential pitfalls. Arne Slot’s impending move to Liverpool – the Dutchman is expected to step into Jurgen Klopp’s sizeable shoes – will leave a pretty big void in the Feyenoord dugout too. Slot, after all, guided the Rotterdam giants to only their second Eredivisie title in the 21st century. Interestingly, the man who took Feyenoord to their first since the Milennium has been tipped to take Slot’s place, Giovanni van Bronckhorst still out of work a ye…