Beckham spent over a decade at Old Trafford, winning the league title six times, and is confident that Sir Alex Ferguson’s side will emerge victorious once more.
"Only one answer. Yes!" replied Beckham when asked whether United would win the title during a Q&A session with H&M.
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"Tough. I love both clubs,” Beckham continued. “I've been a United fan since I was 5 years old but am still in love with Real, it will be a great game."
Beckham also ruled out a career in management after he hangs up his football boots, but is tempted by the possibility of owning a football club.
"Management is not really in my thoughts to be honest,” he added.
"I have the option to buy a franchise in the MLS, so yes to the MLS, sadly a no to Preston,” answered the former LA Galaxy star when questioned about the possibility of buying a club.
Leytonstone’s favourite son also cited his free-kick against Greece as his greatest moment in an England shirt and lauded Zinedine Zidane as the best player he had ever played alongside.
"Has to be Greece but the penalty against Argentina comes close,” added Beckham.
"The best player I have played against is Roberto Carlos, best player I've played with is Zidane."