Sane's future at the Etihad Stadium has been the subject of much debate in recent months and he has been linked with a big-money to Bayern, which is in the market for reinforcements after the exits of veterans Arjen Robben and Franck Ribery.
Reports in Germany suggest a first bid of €80million has already been rejected by City and Bayern president Hoeness said last week that the "financial framework is difficult".
That was a theme Hoeness revisited when discussing a potential move for Germany star Sane with Kicker.
"You have to be a bit sceptical," he said. "It's unlikely that it will work. It's about the sums of money [involved]. They're insane."
Sane scored 10 Premier League goals and provided as many assists as City retained its title last month.