The film examines the difficult period in Beckham's life after he was sent off at the 1998 World Cup.
"There will be a few tears in there from my mum I'm sure," Beckham said.
The former England captain said he valued the support of his teammates throughout tough moments of his career.
"It's the same for all of us six. There were good times, there were bad times, there were troubled times where we all stuck together," he said.
"But that is part of the movie, part of the history of the six of us.
"That is why it makes this such a great story."
More top news
The mystery surrounding the death of Knut the polar bear, who collapsed in front of hundreds of shocked zoo visitors, has been solved.
They are birds with an image problem, but vultures - nicknamed 'nature's undertaker' - are in decline which could spell disaster for humans.
A new trailer has been released for the upcoming Star Wars film, The Force Awakens.