Serge Gnabry did not suffer a serious injury during Bayern Munich's 2-1 victory over Freiburg, Hansi Flick has confirmed.

Germany international Gnabry sat out last weekend's loss to Borussia Monchengladbach with a shin problem but played 90 minutes in the shock penalty shoot-out loss to Holstein Kiel in the DFB-Pokal on Wednesday.

He had to be replaced after 28 minutes at the Allianz Arena on Sunday but Flick is not expecting to be without the winger for a prolonged period.

"The injury is not serious, I have heard from the doctors. The muscle in his back cramped up," said the Bayern boss.

Bayern were leading when Gnabry departed thanks to Robert Lewandowski's 21st goal of the season, a record for the first half of a Bundesliga season, surpassing Gerd Muller's 20 in 1968-69.

Nils Petersen equalised for Freiburg in the 62nd minute, scoring just 28 seconds after coming on as a substitute. His Bundesliga record for goals after being subbed on now stands at 28.

But Leroy Sane, who replaced Gnabry in the first half, set up Thomas Muller - who registered his 125th top-flight assist on Lewandowski's opener - for the winner.

Sane was also on target against Kiel and Flick has been pleased to see him improving after a tough start to life with Bayern following his move from Manchester City.

"I don't like singling out individual players but he did very well and did things the team would like to see from him," said Flick.

"We saw good development. He proved today that he is always good for an assist or a goal."

With RB Leipzig having been held to a 2-2 draw by Wolfsburg on Saturday, reigning Bundesliga champions Bayern opened up a four-point lead at the summit.

Flick said: "I'm not interested in the table at the moment. We have to look at ourselves and be focused on Augsburg and Schalke as we are today.

"It's good to have achieved a four-point lead, that is extremely important. For us, only our results count."

Hansi Flick wants every member of his Bayern Munich team to work on turning their defensive struggles around as they prepare for a dangerous Bundesliga clash with in-form Freiburg.

Bayern saw their hopes of a second successive treble ended on Wednesday as they suffered a shock DFB-Pokal exit at the hands of 2. Bundesliga promotion challengers Holstein Kiel.

They conceded a 95th-minute equaliser to make it 2-2 at the end of normal time, with the second-tier side going on to prevail 6-5 on penalties.

Flick's side have not kept a clean sheet since the Champions League win over Lokomotiv Moscow on December 9, while the second of just two shutouts in the Bundesliga came back in the 5-0 defeat of Eintracht Frankfurt on October 24.

Bayern have faced the fifth-fewest total shots in the Bundesliga (160) but have conceded the sixth-most goals with 24, that total 12 more than the league leaders' closest challengers, RB Leipzig, who could have leapfrogged the Bavarian giants by the time Freiburg visit the Allianz Arena on Sunday.

Freiburg have won five successive league games and are second in the Bundesliga in 'big chance' conversion rate (58.33 per cent), so Bayern can ill-afford to present them with the kind of opportunities they have afforded their opponents all too often in 2020-21.

"It's going to be an intense game, Freiburg is known for that type of football. They're scoring a lot of goals," Flick said during a media conference on Friday.

"It's going to be about us and how we play in defence. It's down to us, the disappointment we had to digest pretty quickly, we have to make the best out of the situation now.

"The whole team is under pressure in defence, it's not only the back four. We're not getting enough pressure on to the ball, not as much as we used to."

Adding that Bayern's remarkable treble-winning efforts of last season were "not normal", Flick said: "I did expect us to experience a bit of a slump a little earlier but my team showed incredible mentality and we made it to the top of the table before the winter break.

"The engine isn't running smoothly, on Wednesday we experienced it in the most brutal fashion.

"We're making it too easy for the opponents to make chances, we have to be in better positions, we have to defend together.

"It's our job and it's our expectation to get back on top."