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 shootouts 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.