Carlo Ancelotti insists Bayern fitness coach Giovanni Mauri is not at fault for Manuel Neuer's latest foot injury.
Neuer, 31, suffered a third foot fracture in six months on Monday and is likely to remain on the sidelines for the rest of the year after surgery.
Sancho, 17, joined Dortmund from Manchester City for a reported €7 million on the final day of the summer transfer window.
The German FA (DFB) fined the Augsburg captain €20,000 for unsporting conduct and imposed a one-game ban.
Reported Chelsea target Rafinha has told Sport Bild he received offers from England and Spain this summer and indicated he could be open to leaving.