The 3 games ahead of Bayern Munich are all tough games for them. First they will face Frankfurt who are just below them in the Bundesliga standings, second they will face Stuttgart who although on paper are on Bayern Munich's side, but they can give a surprise, and lastly they will face Barcelona in the Champions League. Focusing on their match against Barcelona, actually they have a good record when facing Barcelona, but Barcelona is also in good shape now, so this will be a tough game for both teams. On the other hand Barcelona will also definitely try hard to improve their meeting record with Bayern Munich.
I do not see Bayern Munic winning any of the matches lined up for them. They already lost one against Aston Villa and drew two against Bayern Leverkusen and E. Frankfurt. The next match against Stuttgart is likely another loss for them or best they can get is a draw because Stuttgart have not been an easy team for them to beat and this season will not be different. They might want to win Barcelona but that will not be easy because the Catalans are exceptionally good this season.