Dortmund have brought in a number of new faces including Mario Gotze and Andre Schurrle and Bayern Munich forward Thomas Muller thinks that this can only be positive for German football.
"It's good fun when your Germany team-mates play for your main rival at club level. It is important for Bayern and for the Bundesliga that Dortmund are strong," Muller told 'Sport Bild'.
"They put up a great fight last season and set a new point-record for the runners-up for a reason," he added
"It's an extra incentive for us [that Dortmund have strengthened their team]. That only makes it more fun to beat them again".
Will Bayern come out on top in the Bundesliga once again?