(L-R) Moenchengladbach’s Swiss midfielder Granit Xhaka, Moenchengladbach’s midfielder Christoph Kramer and Moenchengladbach’s Spanish defender Alvaro Dominguez celebrate after beating Bayern
The defeat, further soured by a first half injury to top scorer Arjen Robben, was Bayern’s first home loss in the league in 11 months as Monchengladbach regained third spot from Bayer Leverkusen.
Raffael powered in an effort, which squirmed through Bayern goalkeeper Manuel Neuer, for the opener on the half-hour mark.
Despite Bayern’s dominance, a compact Monchengladbach side continued to frustrate the champions, with substitute Thomas Müller’s volley straight at Yann Sommer the best effort from them in the opening 15 minutes of the second period.
Monchengladbach on the other hand went even closer with 20 minutes to go when Andre Hahn struck the post.
That close call was momentarily followed by the game winning second from Raffael 13 minutes to the end, meeting another ball in with another first-time effort to seal a memorable result for Monchengladbach.
Bayern nonetheless still have a 10-point lead at the top of the Bundesliga, with second placed Wolfsburg playing out a 1-1 draw at mid-table Mainz 05 in Sunday’s other match in the top flight.
Monchengladbach meanwhile is third with 47 points, seven points behind Wolfsburg and two ahead of Leverkusen, that had claimed a 1-0 win at Schalke 04 on Saturday.