United won the World Club Cup in Yokohama on Sunday by beating LDU Quito 1-0 in the final.
Ferguson added: "Winning the competition was a great boost to the club and the players. It was a great achievement and the important thing was they played well.
"They showed good enthusiasm through the matches and good concentration. We have come through it well."
Ferguson's only signing during the summer's transfer window was striker Dimitar Berbatov, who cost £30m from Tottenham.
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