The former England international is under contract with the Potters until 2019, having signed a one-year extension last November, but he has since confessed that he is unsure whether he would play for them in the Championship.
"It's a difficult one. I signed for another year because I thought we would be in the Premier League, it didn't even enter my head that we wouldn't be," he told Sky Sports News when asked whether he will stay at Stoke if they go down.
Stoke head into their final two matches of the season three points from safety, although several of the teams above them have played one game fewer.
The club previously confirmed that manager Paul Lambert is likely to keep his job if they are relegated.