The England international winger has two-and-a-half years remaining on his existing deal, but is keen to commit his long-term future to the North East outfit.
"If it keep dragging on it will be a problem," he told the Daily Mirror. "I don't want it to become a problem. What we are trying to do is reasonable.
"I have two years left after this. We have been in negotiations quite a long time so it has been dragging a bit. I have asked the club to move on and I want it out of the way.
"I was honest with (chief executive) Keith Lamb and I told him the club has to move forward. We have to build.
"Now I will leave it to my agent and I will concentrate on football. If I don't it will play on my mind and then you lose focus which can affect the team and that can't happen."