Beckham is back at Old Trafford for the first time since leaving United in 2003.
"I wanted to stay for my whole career, but sometimes things aren't meant to be," Beckham told Match of the Day magazine.
"I've been to three great clubs since I left United, but it would've been great to stay there like Ryan Giggs has. Being at one club for so long is a real achievement."
On his relationship with Ferguson, Beckham added: "It will be good to see him again. He's a scary man, but in a really good way.
"He's played such an important role in my life, and during my time at United he was like a father figure to me and I will always be grateful for that."