Since the summer window is already closed. I'm trying to make a small recap. Chelsea is becoming a club with most of sales in this window. They recorded €342m alone, which is breaking their previous record around €240m - €250m range. Almost €600m generated by just in a short time. They're crazy in player business, and they should get an aware to be the best salesman now. Bournemouth and Leverkusen are following Chelsea at the 2nd and 3rd. No doubt they generated so much money as they get rid almost all of their key players. Meanwhile, Liverpool is at the 4th with €220m generated from their sales. That's big, but they still suffer huge deficit since they spent far bigger than it in this summer window.
As for Chelsea, I am seriously surprised that their transfer chief is this good in getting a better deal for average players, and they still manage to strengthen their team more than last season, so on that note, it's obvious that they are the biggest winner in this year summer transfer window.