The France winger is tied to Bayern until 2023 and attracted enquiries from Manchester United last summer.
"We will deal with a possible extension at the appropriate time," said Rummenigge. "Kingsley is not for sale."
Bayern coach Hansi Flick is delighted with Coman's form and added: "He is implementing the idea that we have very well, and he currently has a large number of goal assists. That's why he is one of the best in this position for me."
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