Wootton left Old Trafford this week to sign permanently with Leeds.
Crerand told the Yorkshire Post: "They've done a terrific bit of business. I wasn't expecting him to be sold and, to be honest, I'm surprised he's gone. There are a lot of kids at Manchester United and many of them aren't going to make the grade but I thought he had a chance.
"Over time I think Leeds will be very happy with this deal."
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