Rangers pre-season has been a struggle on and off the pitch with the players’ performances doing little to help the mood amongst the support. The manager has a squad that is starting to improve with the addition of Vaclav Cerny but, when you look at the team that started in Berlin, there is still a lot of work that needs to be done. Here are your Rangers player ratings for the end-to-end encounter against Union Berlin with the proper football starting in just seven days time. READ MORE: Rangers transfer history from 2016 to presentRangers player ratings v Union BerlinClement will be hoping tha…