Sir Alex Ferguson enjoyed years of success at Manchester United. In his near 30-year spell at Old Trafford the Scot won 13 top-flight titles, two Champions League trophies, five FA Cups and four League Cups.
He's widely regarded as one of the world's greatest ever managers as a result, but Ferguson did have to splash some cash at times to achieve all that he did at United.
Here we take a look at the ten most expensive players signed by Ferguson and determine whether they were a success of failure.
From Ruud van Nistlerooy to Robin van Persie, there are some big names in this list. 10. Antonio Valencia Cost: £16million The Ecuadorian caught Ferguson's eye while at Wigan, and he completed a big-money move to United in 2009.
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