"I've struggled to understand AVB's tactics," Sugar told talkSPORT. "You wonder how we are going to get a goal.
"Four, five or even six games before [the 6-0 defeat to Manchester City] you couldn't see where the goals were coming from.
"The formation that AVB plays, I don't understand at all. I put my hands up, I am no great football expert, but I don't understand it at all."
And Sugar would like to see Ferguson replace Villas-Boas.
"My dream would be that my good friend Sir Alex Ferguson will get itchy feet in about a year or so and decide he wants to get back into management and maybe bring his wonderful wife down to London and manage our team," Sugar added.
"If he comes to watch the game, I will suggest some nice houses for him and his wife to stay in."
Sugar added: "(Chairman) Daniel Levy did a very good deal with [Gareth] Bale. He was going, there was nothing he could do about it, and he has given (sporting director) Franco Baldini the money to go out and spend, but I wonder if it is just a case of spending for the sake of spending it.
"Maybe we should have sat back a few moments and been a bit selective, a bit like (Arsenal boss) Arsene Wenger."
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