The defender says he wants to spend the rest of his career at St James' Park.
Dummett said, "My main focus is to be fit playing for Newcastle and stay here for the rest of my career.
"It was a difficult decision because playing for your country is an honour.
"We will have to see what happens in the future, but with the age I'm at and the time of my career it made sense for the decision I've made.
"I want to be fit playing for Newcastle and doing well, that's my main priority."
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