The former Old Trafford star is confident that United will weather the coronavirus pandemic in better financial shape than most.
Sancho has been a long-term target for the Red Devils and could be on the move this summer.
Borussia Dortmund has imposed a price tag of £ 100 million on its precious assets, which could prevent any transaction.
But Ferdinand is already licking his lips at the prospect of an English pair in Manchester.
“Financially, Man United is in a stronger position than most of the others because of the club structure,” Ferdinand told the Beautiful Game Podcast.
“I would definitely buy Sancho. Can you imagine Sancho in this team with him drawing like two or three players for him and then Rashford playing one against one? Oh my God. It’s finish. “
Ole Gunnar Solskjaer is in the midst of an overhaul at Old Trafford as he seeks to change the club’s transfer strategy and play style.
Young local talent is a priority in recruitment, hence his interest in Sancho.
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Rashford has so far paved the way for United in the goal standings.
The academy graduate now plays under his third manager since entering the scene in 2016, but the Norwegian says the attacker’s ability has never been in question.
“Rashford could be up there with the best, 100%, because he just has crazy talent,” he added.
“From a kid I’ve seen him play, whether front, wide or drifting, he has always had a crazy talent and at Man United, in the halls, they always knew it. “