The 27-year-old has made a success of moving up to the Premier League and his recent displays have has seen him suggested as a contender to take over from Paul Robinson if the form of England's first-choice continues to dip.
Green has backed Robinson to return to form but is also confident of his own ability.
Asked whether he thought he was the best in the country, Green said: "You have your beliefs and you believe that you are. You have to believe it because if you don't there are enough people to knock you around and tell you are not.
"A lot of it is down to chances in life and the opportunities you get to establish that. At the moment I've had chances to establish myself at Norwich and here. I don't think I've had an opportunity beyond that."
Green is prepared for the scrutiny that comes with being an England goalkeeper if he does get a call-up.
"At Norwich it was equally scrutinised, people have a pop when you have a bad game," he said.
"It comes with the territory and I'll not pick up the newspaper to read or watch the television."
