Arsenal's Champions League rivals are in crisis due to poor results and injuries.
Nobody saw it coming. Borussia Dortmund are on a three game losing streak and suddenly the word crisis is being used.
German newspaper Bild even write: 'Klopp's first major crisis' - describing it as the toughest challenge he has faced since taking over as manager in 2008.
Just three weeks ago everything was moving swimmingly. Dortmund had thrashed Stuttgart 6-1, and they were preparing to welcome Arsenal, an opponent they had beaten 2-1 in London. A win was certain, right?
The night before the game, bad news began to surface. Mats Hummels would miss the game with niggling injuries.
Then the Gunners struck. Aaron Ramsey's winner sealed a memorable win, the first of three games in succession Dortmund would lose.
Wolfsburg pulled off a shock 2-1 win over last season's Bundesliga and Champions League runners-up, with former Bayern man Ivica Olic striking a second half winner.
During the game it began to go further wrong. Neven Subotic suffered a cruciate knee ligament injury, which will keep him out for the season.
Teammates Mats Hummels and Marcel Schmelzer also later suffered injuries which will rule them out for several weeks. It means Dortmund are missing three of their first choice four defenders.
So the visit of Bayern at the weekend came at a dismal time, with Pep Guardiola's side scoring three second half goals to triumph 3-0.
In under 24 hours time, they could also be out of the Champions League, if they lose to Napoli and Arsenal clinch at least a draw at home to Marseille. Free agent signing defensive Manuel Friedrich, who played against Bayern, is ineligible.
No wonder they are calling it the biggest challenge of Jurgen Klopp's career. He is not dwelling on it, "I told the team in the dressing room: You must now be five minutes depressed, then it goes on."
A Champions League KO may however take longer than five minutes to recover from.
image: © Asia Kuczek