Manchester City will lose 10 per cent of any fee raised from Leroy Sane's sale this summer.
BILD says Sane's former club Schalke will be due 10 per cent of the fee City eventually sell the Germany international for.
Bayern Munich remain in contact with both Sane and City about a deal this summer.
The Sky Blues signed Sane for €50m in 2016 and has a contract with City to 2021.
It's suggested Bayern hope to do business with City over a fee worth €80m for the winger.