The midfielder quit Sunderland for Newcastle last summer.
"I still feel as though I can achieve everything I want to here," he told the Evening Chronicle.
"That was a huge reason why I signed - it wasn't as though I only came because it was my boyhood club and the team I supported as a kid. I saw it as a club with an awful lot of potential there.
"I want to be playing for a successful team, and a team that's coming into St James' Park and winning games. We beat Chelsea and Liverpool, and we need to get back to a level where we're able to compete with those sort of teams, especially at home.
"You have to be realistic, and we're not going to be challenging for the league or anything like that any time soon, but you want to be able to compete in every game. That should be the bare minimum for a club like this."