Ferdinand hasn't played under England coach Roy Hodgson.
He told The Sun: "I haven't spoken to the manager since he told me he was leaving me out of the squad for the Euros.
"I watch England as a fan now, and of course I want them to win, but my focus is on United.
"I concentrate on performing well in my next match and driving us on to getting that title back. I feel as though I could play 50 games this season.
"I've three kids who keep me on my toes and keep me young."