The campaign was Mourinho's third Premier League title win, putting him level with Arsenal manager Arsene Wenger, and behind only Alex Ferguson as the top managers in the Premier League era.
Shaw is now stepping up his return from an ankle ligament injury and has played two games for United's reserve team, recently, but it is believed he only has until Christmas to secure his future at Old Trafford.
Meanwhile, were Chelsea to defend successfully their title they would be only the fifth side to finish top having claimed six points from their first three matches. Suddenly the fees for the players he's spent look like good pieces of business.
"I think we were very clever", Mourinho said.
"Yeah, without a doubt".
The Colombian is very highly rated, even if not by Mourinho, and over the coming seasons the United boss' choice of Lindelof instead could prove to be a big error. "We had fantastic attacking football, we had fantastic domination. we defended amazingly well".
He has played two reserve games already this season after ankle ligament surgery and is fighting to try and force his way back into Mourinho's first-team plans, with Daley Blind now claiming the left-back berth. However, Mourinho stated that he doesn't think about such a thing and has no problem arriving at the end of his contract before signing a new one and therefore being "free to decide" what to do. Keeping Matic fit appears crucial to United's chances of winning the league while Lukaku's goals will determine how far Mourinho's team progresses in the Champions League.
Indeed, while one more high-calibre capture would have been another strong step towards United returning to the status they once enjoyed, it was nevertheless a successful window. Everyone understands we are in a lucky position, we are privileged and many others are not so lucky.
"I think Lukaku on August 31 would have been 150 million pounds and [Nemanja] Matic would have been 60m or 70m", he told the Times.
"So it's going to be tricky. But, anything is possible, right?"