Manchester United manager Sir Alex Ferguson has made some controversial signings throughout his time at the Manchester club.

Some have been proved to be masterstrokes, others have flopped.

Here, GMF looks at some the most successful signings the United boss has ever made at Old Trafford…

5. Roy Keane

Tranfer: £3.75 million

In 1993 Sir Alex made a stunning £3.75 million bid for Nottingham Forest star Roy Keane - a midfielder who later go on to become captain for Ireland and Manchester United. Roy Keane quickly made his mark at the Reds with his aggressive playing style. He was like a shield, covering the back fourth and enabling Paul Scholes to do pretty much what he wanted to. Any midfielder who allows that to happen is pretty good in our book.

4. Peter Schmeichel

Transfer: £530,000

The great Dane, as he was known by the Red Devils during his time at Manchester. Schmeichel is still known as one of the top goalkeepers United have ever had - maybe even the best. He was brought to Manchester United for a fee in the region of £530,000 and is still thought to be one of the best captures completed by Ferguson. One of the greatest Premier League goalkeepers ever - and certainly one of the most imposing.

3. Wayne Rooney

Transfer: £27 million

Wayne "Wazza" Rooney made his first appearance for the Red Devils on the 28 September 2004 after he was bought from Everton in a £27 million transfer. 

His stunning hat-trick in the Champions League group stage against Fenerbache was one of the most memorable debuts ever. And he's gone on to become one of United's key players - winning Champions Leagues and Premier Leagues under Ferguson.

What a signing!

2. Eric Cantona

Transfer: £2 million

Charisma allied to a bit of madness. Eric Cantona had a massive influence both on and off the pitch at Old Trafford.

And Cantona was one of the most skilful players United have ever had. His fierce temper occasionally got the better of him - his infamous kick at Crystal Palace the most well-known example.

But what he's more known for around the world is his goal against Sunderland in 1996 where he calmly chipped the goalkeeper to score a wonderful goal. Great job by Ferguson.

1. Cristiano Ronaldo

Transfer: £12.24 million

Speed, strength, power and technique. Speak about Cristiano Ronaldo and you've got all of that in one player. 

Ronaldo left Sporting Lisbon in 2003 shortly after playing against Manchester United in a friendly. During his six years at Old Trafford he made over 250 appearances for United and scored more than 110 goals. 

He also won the Ballon d'Or in 2008 - the last player other than Leo Messi to do so. When he left Manchester in 2009 he was sold for £80 million to Real Madrid - Ferguson made a £67.76 million profit on this magnificent Portuguese player. Not bad.



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