The Red Devils have spent over £300m on new players since the legendary Scotsman stepped down from his position shortly after leading the club to their 20th league title.
Since his departure the club have appointed David Moyes and Louis van Gaal, with the latter splashing the cash on the likes of Angel Di Maria for a British transfer record fee and an expensive season-long loan deal for Radamel Falcao last summer.
Those deals came on the back of Moyes signing Juan Mata [via BBC Sport] and Marouane Fellaini [via BBC Sport] for a combined total of £64.1million and Queiroz insists both managers are guilty of making mistakes and are going against the traditions of the club:
“I have great admiration and respect for Louis and David,” he said.
“They are great coaches that I admire, but I think they made some critical and crucial mistakes in the transition from Alex.”
“It was always about creating players, now it is the opposite, we see some of the best players going down and even some of the players that arrived in the team like Falcao and Di Maria were on the bench.”
“I saw Di Maria and some games, he looked like he has never played football.”
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Van Gaal once again dipped into the transfer market on deadline day to seal a £36million deal for highly-rated French youngster Anthony Martial from AS Monaco, but Queiroz fears the Dutchman is buying new players for the sake of it:
“There is panic buying. You have to prepare and then make the decisions together. You can still make wrong decisions, but we never made panic decisions when buying players,” Queiroz added.