No Report Available
In February, there were outbreaks of violence before the game between the two sides in Dortmund, with visiting fans attacked.
Keita, 22, has agreed to join Liverpool next summer but, following an outstanding first season in the Bundesliga last time, has found going difficult.
Thomas Muller has been singled out by returning Bayern Munich boss Jupp Heynckes as a leader within the club.
Aubameyang, last season's Bundesliga top scorer, had been expected to leave Dortmund in the summer.
Germany international Werner had been undergoing tests after suffering "breathing and circulation problems."
Bayern Munich CEO Karl-Heinz Rummenigge says Thomas Tuchel remains in the frame to take over as the club's coach next season.