Last night's derby defeat to Manchester City has heaped more pressure on the Scot.
"It is just very unfortunate that they weren't active enough in the first transfer window they had. Had they been, we wouldn't be seeing them in the same sort of problems now.
"They will have to spend a lot of money over two or three windows. I don't think there is a quick fix. This is not going to be solved over one window, it's going to be two or three.
"The United squad has to be revamped."
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