Manchester United is undoubtedly the most successful English club in the Premier League. They’ve won 13 of the 22 EPL seasons, as well as two Champions League triumphs. And a lot of their success is down to their good transfer business over the past two decades.

Manager Sir Alex Ferguson, in charge of the club for 26 years, was a massive part to the Red Devils’ dominance signing players like Wayne Rooney, Ruud van Nistelrooy, Cristiano Ronaldo, and of course Eric Cantona.

However you can’t always get it right, with the United hierarchy purchasing several flop players during the Premier League era.

Here are the TOP FIVE WORST Manchester United signings in Premier League history...

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5. Marouane Fellaini

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Although it’s been only one year since Fellaini’s £27.5million deadline day deal from Everton, the transferred epitomized Manchester United’s worst ever season in the Premier League era.

United have just lost Sir Alex Ferguson for the first time with David Moyes replacing the legendary Scot, and fans expected to see Moyes spend big in order to challenge for the Premier League title once again.

But Moyes was over-cautious, before using a massive £27.5million to bring his former midfielder, who went from double digit league goals with Everton to none last season.

The powerful Belgian still has time to redeem himself under new boss Louis van Gaal, but many have already labelled him the biggest transfer flop of 2013-2014.

4. Juan Sebastian Veron

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Juan Sebastian Veron was signed in 2001 from Serie A side Lazio as one of the best players in the world for a huge £28.1million, but failed to live up to the fan’s high expectations.

There was no doubt the Veron was a classy player, able to pick up players with the long ball and dictate central midfield. However he was never able to adapt to the pace of the Premier League, which saw him caught out more often than not.

After only two seasons United cut their losses by selling him to Chelsea for half the price at £14million, but the Argentine only managed seven league appearances during an injury ravaged season.

3. Massimo Taibi

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In the 1999 summer transfer window spirits were extremely high in the United camp after their incredible Treble of League, Cup, and Champions League success. But legendary goalkeeper Peter Schmeichel left the club, forcing Ferguson to search for a successor.

His replacement was Massimo Taibi, purchased from Venezia for £4.5million and had a decent start for the Red Devils with a man-of-the-match performance against Liverpool. However in his third game against Southampton the Italian was the victim of one of the worst goalkeeping blunders in history, as he let a weak Matt le Tissier shot trickle under his legs (1:40 in the video).

The next match United lost 5-0 to Chelsea, which was the last Red Devils saw of the Milan youth goalkeeper.

2. Anderson

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Anderson is still on the Manchester United roster, but it is a bit of a surprise the Brazilian hasn’t been offloaded already.

The 26-year-old was a massive £25million purchase from FC Porto back in 2007, after his exploits with the Portuguese side dubbed him as the ‘next Ronaldinho’.

Anderson arrived on £3million less than Veron, but although Veron showed signs of immense class, Anderson was never able to fulfil the potential legendary Brazilian World Cup winner Tostao dubbed to be as good as Neymar.

Many other flops – like Kleberson and Djemba Djemba – came as unknowns but the huge hype surrounding the Anderson signing and massive fee make the midfielder one of Ferguson’s worst ever transfers.

1. Bebe

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Number one on the Manchester United worst transfer list is none other than Bebe.

The Portuguese winger/striker was technically not even Alex Ferguson’s signing, as then assistant manager Carlos Quieroz recommended Bebe to his boss and the Red Devils went on to sign him for a £7million fee.

However the 24-year-old was unable to convince anyone at Old Trafford of his abilities, making only two appearances to the supporters’ bewilderment.

Not only were the fans confused, but so was Ferguson... who had reportedly never seen Bebe play.

This statement from Bebe summarized the relationship: "He told me to cut my hair, it will look better. So I cut it the same day. In the next training session, he didn't recognise me. I went past him many times and he didn't know me.”

Bebe was sent out on loan three times, but surprisingly, had a successful 2013-2014. He has however confirmed his departure recently, ending his Manchester United career.