Celtic fans still hold a deep affection for the former Celtic manager, Ange Postecoglou, and after what he said about Scotland last night, he’s probably won a few new fans in the Tartan Army. Postecoglou revolutionised the way Celtic played football during his two-year stint in Paradise and won five out of six domestic trophies, including the record-breaking eighth domestic treble. And at the heart of Postecoglou’s success was, of course, Celtic captain Callum McGregor. An ever-present in Ange’s team, McGregor was pivotal to the success the Australian enjoyed and Postecoglou has backed his for…