Rangers transfer duo Philippe Clement and Nils Koppen have some big decisions to make ahead of the summer transfer window. Whilst Rangers are still well in the hunt for a domestic treble, the squad’s limitations were shown up in the Round of 16 Europa League clash with Benfica. A stuttering start to the season, persistent injuries, and a general imbalance in the squad has contributed to a sentiment that change isn’t just coming in the summer, but that it’s necessary. Throw into the bargain the fact six important first-teamers are out of contract come the end of the season – and high-earners am…