United Kingdom, April 11 -- David Beckham's ownership of Inter Miami has been the "biggest challenge" of his career.

The 49-year-old soccer icon is the president and co-owner of the Miami-based club, and David admits that it's been a challenging experience to grow the team from nothing.

He told People: "When we first announced it, I thought we'd have the team up and running in a few years."

David's ambitions for the club faced a series of setbacks and delays, before he managed to get the project off the ground - but he's now thrilled with the club's progress.

The former England captain - who played for the likes of Manchester United and Real Madrid during his career - shared: "It's been the biggest challenge that I've had in my career...