BILD says Bayern are determined to bring Sane back to Germany in 2020 - either in January or at the end of this season.
And on the negotiating table will be Coman, a favourite of City boss Pep Guardiola. The Catalan worked with Coman while in charge of Bayern.
Last week, Bayern chief Hasan Salihamidzic was in England, fueling talk of a meeting with City about Sane.
It's been suggested it will take €100m to buy Sane, though that price would dramatically fall should Coman be included in Bayern's offer.
Sane is currently recovering from August knee surgery.