Ferguson admitted he was relieved the celebrations to mark his retirement were over.
They culminated in his last match in charge, a 5-5 draw at West Brom.
Ferguson said: "It has been overwhelming. The club has been fantastic and congratulations to West Brom with the way they handled yesterday.
"In a way I am glad it is all over now - because it has been hard work!
"I think (West Brom manager) Steve Clarke should get an award because anyone who scores five against United deserves it."