Sir Alex Ferguson appears in trailer for David Beckham Netflix documentary and takes huge swipe at his former star

SIR ALEX FERGUSON appeared in the trailer for Netflix’s upcoming documentary on David Beckham.

And the ex-Manchester United boss took a huge swipe at his former star with an explosive remark.

Netflix/BECKHAMSir Alex Ferguson has appeared in the trailer for David Beckham’s Netflix documentary[/caption]

Netflix/BECKHAMBecks has lifted the lid on his career in a four-part series[/caption]

Beckham, 48, is set star in a four-part series that will appear on streaming giants Netflix from October 4.

Documenting the ups and downs of his incredible career, the show will explore Beckham’s biggest moments on and off the pitch.

And the England legend has also promised to reveal other less-known tales following spells at clubs like Real Madrid, AC Milan and LA Galaxy.

Former teammates and pals like Gary Neville, Roy Keane and Roberto Carlos are set to spill the beans on Becks.

But there will also be an incredible cameo from his ex-United manager Fergie.

The pair famously clashed as Beckham became a pop culture sensation, culminating in the midfielder needing stitches after Ferguson accidentally kicked a boot at him in 2003.

Becks ended up moving to Real Madrid later that year.

And speaking in the documentary regarding the media coverage of his relationship with Spice Girl wife Victoria, he claimed: “My life had become something different. It definitely didn’t change me.”

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PA:Press AssociationFergie and Beckham had a tumultuous relationship at Man United[/caption]

But Fergie had something to say about that, with the Scot appearing in the trailer blaring: “Well, he changed. There’s no doubt about that.”

Later on, Ferguson did pay tribute to Beckham’s mentality, adding: “There was something inside of him, that determination.”

Fergie has previously spoken about his relationship with Becks, saying in 2013: “The problem for me, I’m a football man, he fell in love with Victoria.

“That changed everything. Being a football man, I had to think about where we were going for that.”

Criticising Beckham’s high-profile move to the MLS in 2007, he added: “If he had asked my advice when he left Real Madrid for LA Galaxy, I would have told him exactly what I thought.

“How can you leave Real Madrid for LA Galaxy? He reinvented himself a couple of times to go to AC Milan then PSG. That’s because of his natural stamina. At the end I think he did miss the big time football.”

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