Harry Redknapp is the favourite for the post and a number of managers have voiced their support for his candidacy.
“You can’t believe [I’ve been sent a letter], can you?” said Ferguson.
Asked why he had received the warning, he said: “I’ve absolutely no idea. I’m not supposed to discuss it.”
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Who of Europe’s top strikers will move to England this summer?
After a dreadful start to their Bundesliga campaign, Borussia Dortmund appear to have weathered the storm after going five matches without defeat.