Bayern Munich suffered a double blow on Friday night with Daniel van Buyten picking up a suspected broken foot in addition to the 3-1 defeat at Borussia Monchengladbach.
Van Buyten will undergo tests this weekend after leaving the field following a challenge with Marco Reus, but the initial diagnosis of a broken foot could mean a lengthy absence, adding insult to injury on a disappointing night for the Bavarians.
"Of course we are not happy,'' said Bayern captain Philipp Lahm to Sky television. I don't think we were worse, we just lost the game, it's a simple as that.
"We made too many mistakes and you get punished against a good team like Gladbach.
"You just need to look at the goals we conceded and then you know what mistakes we made. Otherwise, I don't think we let them in too much and we created lots of chances.''
Bayern coach Jupp Heynckes had warned of the perils of Gladbach's counter-attacking football before the game and he was proved right as the home team taught his side a lesson.
"We played into their hands,'' said Heynckes. "The turning point was the 2-0 which came on the counter after we lost possession just before the break.
"It is hard to come back from that against a side who defend so well and are very well organised at the back with 10 men in their own area.''
Gladbach coach Lucien Favre was delighted with his side's performance, on the other hand, and also with his side's start to 2012 as they moved to within a point of Bayern at the top of the table.
"We wanted to win and it was very important psychologically because it was the first game of the second half of the season,'' he said.
"We now have two away games against very, very good teams and they are going to be tough, which is why it was so important to get at least a point. We won three points so that is perfect.''