Tottenham Hotspur head into the summer transfer window with plenty of work to do as Ange Postecoglou looks to shape his squad in North London. If we know anything about Ange Postecoglou, it’s that he wants to win. The Spurs boss is used to winning; he was a champion in Japan and a champion in Scotland before heading to the Tottenham Hotspur Stadium. Fifth place and Europa League qualification wasn’t a bad finish for Tottenham, but not quite what Postecoglou wants. Tottenham therefore need to go through major changes this summer in order to advance on the path Postecoglou has in mind. That mean…