It’s safe to say that Rangers didn’t quite nail the summer rebuild and that Philippe Clement still has work to do over the next two transfer windows. He will have help off Nils Koppen who, having started work at Auchenhowie, will hopefully be able to help the Gers boss to fine tune his squad. Rangers will need more depth up front when Kemar Roofe’s contract expires in the summer and these are the realistic pre-contract agreement options available to Philippe Clement just now. Rangers could sign these three free agents under Philippe ClementI’ll warn you now, it isn’t an extensive list but it i…