United failed in last summer's transfer market with rookie chief executive Ed Woodward in charge.
Royle told the Daily Mail: "Football, and sport in general, has never been more exciting with a global audience transforming the financial infrastructure of so many businesses but to manage that growth they have to change and change quickly.
"Football has seen perhaps the biggest growth and one man cannot run the club in the way Sir Alex did.
"In 1995 when I won the FA Cup with Everton against Manchester United, I had a total of seven back-room staff. Since then, with the explosion of the Premier League and sport developing into global brands, organisations have evolved into complex and sophisticated structures.
"Sports science, sports medicine and sports psychology have become an everyday part of an armoury in all sports. As a result there is a need to make sure these well-equipped organisations run smoothly and efficiently in high performance, high pressure environments.
"In the future sporting directors will do this by championing the vision of an organisation, ensuring its staff live and breathe a winning philosophy and create a culture of success on and off the field."
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