The Glazers splashed out £790million when they bought the club in 2005.
Joel told the People: “Sir Alex Ferguson will be given all the resources to compete at the highest possible level.
“When you’re around this club, following this club, the heritage, the history – when you’re walking around Old Trafford, it’s an incredible feeling.
“But with it comes a lot of responsibility, and we take that very seriously.
“Manchester United are one of the very few truly global sports teams in the world.
“We have a global fan base of 140 million. It’s the only club we were ever interested in.”