Van der Sar says the Portuguese will need time to bed down his methods.
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He said on the Rio Ferdinand Presents podcast: "How long do we have? No, I think stability is the main thing. I think there's always been a lot of opposition, let's say, against the Glazers.
"They bought the club, and the last 10, 12 years have not brought that (success) to Manchester United. And I think the line what they have now with a new CEO, a new football director, a sport director, you have Jim Ratcliffe responsible for the sport side.
"The Glazers are still on the commercial side and have the major ownership. I think you have to give it time now, to develop that stability that the club needs."