Bayern Munich were beaten for just the third time in the Bundesliga this season as they slipped to a 2-1 defeat against Borussia Monchengladbach as German football returned from its mid-season break.

First-half goals from Florian Neuhaus and Stefan Lainer cancelled out Robert Lewandowski's opener at the Allianz Arena, and Julian Nagelsmann's men were unable to find a way back into the game in the second period.

The defending champions had been hit by numerous positive COVID-19 cases in the build-up and were missing several key players including Manuel Neuer, Dayot Upamecano, Kingsley Coman, Alphonso Davies and Leroy Sane.

However, in a game behind closed doors with the snow falling in Munich, a nonetheless strong Bayern starting line-up was unable to avenge their 5-0 humbling by Gladbach in the DFB-Pokal this season.

Yann Sommer made two big saves early on from Serge Gnabry and Lewandowski, but the Poland star was never likely to be denied for long and he had Bayern in front on 18 minutes when he collected a Thomas Muller pass, before turning his marker and firing in at Sommer's near post with the usual precise venom.

Entirely against the run of play, Gladbach were level just nine minutes later. With the first real attack from the visitors, a cross was poorly cleared by Joshua Kimmich and the alert Neuhaus fired the ball in under Sven Ulreich.

That sparked Adi Hutter's team into life and they were ahead just after the half-hour mark when a Luca Netz corner was headed in well by Lainer.

Gladbach were the ones pressing for another as they started to dominate the hosts, with Neuhaus and Breel Embolo both coming close to getting a third, before Lewandowski hit the post from a tight angle just before half-time.

Sommer saved well from Jamal Musiala early in the second half while Lewandowski hit the woodwork again, but despite a late push for an equaliser, the league leaders were kept at bay.