And, even back then, Beckham turned up to Tottenham training in a Manchester United shirt - that's how much he dreamed of playing at Old Trafford.
Indeed, the former Tottenham and Arsenal centre-back was picking his dream team for Sky and, naturally, included Beckham at right-wing.
Campbell told Sky Sports: "I used to train with him when he was around 13 at Tottenham but he always knew where he wanted to go because he used to come in in his Manchester United training kit.
"It was his dream to play for United. What a player! He had his free-kicks but he was hard-working and had brilliant vision. He deserves everything he has got. He's a brilliant player but now a brilliant ambassador around the world as well."
It's no surprise Beckham wore United shirts to Tottenham training and it's no surprise that kind of attitude earned him his dream move in the end.
It's still intriguing, though, to hear the fact the Manchester United great was in training together with Campbell in north London during his early years.
After Campbell's move to Arsenal later in his career, of course, Tottenham fans will likely think of Beckham more fondly than the defender himself, despite his Spurs link pretty much ending with him training at the club when he was 13...
Spurs host Liverpool during Saturday afternoon's early Premier League kick-off at White Hart Lane.