Celtic fans will be riding the coattails of a brilliant week that ended in a thumping derby victory over Rangers last Sunday. In a period when the transfer window also ended and the Bhoys found out their Champions League league phase opponents, supporters have a lot to be excited about right now. The late scramble for arrivals at Celtic Park didn’t disappoint. Arne Engels, Luke McCowan and Auston Trusty came through the door on deadline day. Meanwhile, Alex Valle was loaned in earlier in the week. Evaluating the squad, some would argue the only place that may still require surgery is the wide …