Javier "Chicharito" Hernandez will miss Bayer Leverkusen's first match of the new Bundesliga season at Borussia Monchengladbach with a fractured hand.
Indian youngster Chandan Nayak will train with Bayern Munich after coming through a talent competition for players up to five years older.
Borussia Dortmund defender Neven Subotic's agent has confirmed he is in "interesting talks" amid speculation of interest from Fiorentina.
Gnabry, 21, impressed for Germany at the Olympics, scoring six goals as they won silver.
Robert Lewandowski believes he can get even better in Bayern's new system, saying the players "don't have to go pressing in attack all the times."
Thomas Tuchel is content with Borussia Dortmund's performance in their 3-0 DFB-Pokal defeat of Eintracht Trier, despite their lack of finishing.