Manchester United extended Erik ten Hag’s contract at the club but any fan could see it came with some promises attached. The biggest change that has been visible is the overhaul in the coaching staff, where his right-hand man Mitchell van der Gaag left, joined by Benni McCarthy. In came Jelle ten Rouwelaar, Ruud van Nistelrooy, and Rene Hake in a complete refreshing of the support structure around the manager. These are the changes just this summer but the seeds had been planted earlier, when Eric Ramsay left in the middle of the season last year to pursue head coaching ambitions. He went to …