Sir Alex Ferguson insists Manchester United´s Barclays Premier League title defence could yet unravel.United occupy a seemingly unassailable position at the summit, with nearest rivals Chelsea trailing by five points with four matches remaining following a 1-1 draw with Wigan on Monday.But Ferguson is refusing to open the champagne just yet and said: "Wigan holding Chelsea puts us in a good position but in my experience in life you don´t take things for granted."
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