Rangers will have a long two weeks turning up at training having to wait to make amends for the collective shambles served up at Parkhead. Philippe Clement won’t be getting much sleep either as he mulls over the decisions that he made before and during the Old Firm derby. The manager has a long time before he gets another shot at Celtic with a lot of games between now and then, but what does he have to do to bring calm and order back to Ibrox? READ MORE: How Rangers should line-up for January Old Firm, will Philippe Clement make these seven changes?Five things Rangers need to do to improveJust…