Sergei Grits, Associated Press
FC Bayern Munich's head coach Jupp Heynckes reacts during group F Champions League soccer match against Bate Borisov at Dinamo Stadium in Minsk, Belarus, Tuesday, Oct. 2, 2012.

FRANKFURT — There were signs of tension at Bayern Munich even before the Bundesliga powerhouse fell to its first defeat of the season, losing 3-1 at lightly regarded BATE Borisov in the Champions League.

At home, Bayern is off to a perfect start with six wins from six matches. Sporting director Matthias Sammer still found fault with the team's performance, drawing the ire of veteran coach Jupp Heynckes.

The unexpected loss against BATE this week only highlighted the differences, although both men tried to present a united front after the team's return from Belarus.

Bayern President Uli Hoeness defended both men and said their differences were exaggerated by the media.

It remains to be seen how the team will react in the Bundesliga on Saturday against Hoffenheim.