Without question, Bayern have, by a considerable margin, the strongest and most deep squad in the Bundesliga. That depth has been invaluable to the treble holders, who have had to cope with a blight of injuries to key players in their squad, including Bastian Schweinsteiger, Thiago Alcantara, Mario Goetze, Arjen Robben and more.
The absence of many star players has been a problem Bayern have managed rather well. But it has taken its toll, as it's made serious physical demands of those who have remained fit. Philipp Lahm, for example, has barely had a break all season long.
Bayern lost their focus and blew a two-goal lead against Manchester City in midweek and, on Saturday, did not exactly look their sharpest. It's far from a crisis situation in Munich, but two consecutive performances below Bayern's enormously high standards prompt questions of why they are not playing their best football right now. Fatigue is certainly a possibility, and having pressure to perform at this point may play a role.
Bayern will have to be careful to find their best form soon with the Club World Cup in Morocco looming. They have as many as two one-off matches to play before taking on Gladbach on Christmas Eve in their final match of 2013.