United brought in a number of new players over the summer, including the likes of Radamel Falcao, Angel Di Maria, Marcos Rojo and Ander Herrera.
And the former United boss believes that all of the signings Louis van Gaal has made since taking over at Old Trafford in the summer have proven to be astute pieces of business.
Ferguson told MUTV: “I think when you can identify ability like that needed by Manchester United, they [the club] have the resources to do that [the club-record Di Maria deal].
“They are fees I never quite equalled but nonetheless they were needing quite a big injection this year.
“They brought in some good quality. It was really important as you need quality at Manchester United, you need the best players. It’s the rebuilding of the team.
“[Ander] Herrera played against us three years ago for [Athletic Club] Bilbao in the Europa League. In fairness, they gave us a right battering at Old Trafford.
“He’s a talented young player and we scouted him quite a lot at that time. Obviously they tried to get him last year but it fell through for some reason or another. He’s athletic, quite aggressive actually for a lad who has not a got a great frame as he’s quite slim but he gets around the pitch.
“Rojo, the Argentinian boy, I watched him at the World Cup, I thought he did really well for them and I think he’s capable of playing either left side as a wing-back if you like or as a centre-back.
“Daley Blind is one of those common-sense footballers who make up a team. He’s probably a version of Darren Fletcher of a few years ago, that type of player. He’s a good professional with common sense to his game. He keeps it simple and protects the defenders and the attacking midfielders in his role.
“The big one is Falcao who we’re all waiting to see. Obviously, he has fantastic goalscoring ability. He had his injury so getting him on loan is the right thing to do.”
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