In a significant blow to the German champions, Sane suffered a knee ligament injury on the eve of the new season.
Sane was expected to complete a big money move to Bayern, but that has been put on hold for the time being.
It is unclear if Bayern will come back for Sane in January or next summer.
"Basically, as all of you know, he is a player of Man City and we don't speak about players who are under contract in another team," Bayern sporting director Hasan Salihamidzic told reporters.
"But I am sad and really feel sorry that Leroy got heavily injured against Liverpool and I wish him all the best."