Mr Cameron also became the 150,000th member of the virtual squad on the England Facebook page and gave his support to the FA’s England Football Day, which is being held today.
The PM said it was a great way to encourage people to take part in the “beautiful game”, whether by watching, playing or coaching.
The PM said:
I want to wish the England team and Fabio Capello every piece of good luck for the whole of the World Cup, that’s starting with tonight’s vital game against the United States of America.
I keep saying: ‘We’re all in this together.’ And that’s particularly true when it comes to cheering on the England team.
Find out more about England Football Day on the FA website.