The Germany international, 28, is inside the final 18 months of his current deal.
Tah has been linked with Newcastle and West Ham this season.
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Rolfes told Sky Deutschland: "We are interested. Jonathan also knows that we would like to extend."
Rolfes continued: "At this stage of the season he wants to focus on the games. That applies to us as well. Then we will sit down together and try to find a good solution. I am optimistic about that now."