The 41-year old made only six starts for the Potters in 2016-17, but he believes he can help serve as a back up at another Premier League club or drop down to the Championship.
Speaking to the Irish Sunday Independent, the former Newcastle goalkeeper is confident he can continue a career that has seen him amass 636 games and 134 caps for the Republic or Ireland.
"Yes I am 41, but I do feel I could go on for another year, be it as a number two or three in the Premier League, or number one in the Championship.
"There might be one last hurrah, a promotion, (it) just depends what is out there. I have no divine right to get a club but if someone came along and it was of interest, it might happen.
"I know the end is near. It could be this year, could be next year, but once you do retire, especially at my age, you can't go back in six months and say, 'I've changed my mind and I want to give it another go', and every ex-player I speak to says continue as long as you can."