Bayern Munich has a massive Champions League test against Arsenal tomorrow, and Karl-Heinz Rummenigge knows exactly what is at stake. The former Bayern Munich CEO also provided a concerning update on Vincent Kompany, whose illness could prevent him from taking his place on the touchline.

“It’s a classic. During my time asCEO, we played against them almost every year—and won almost every year. Last year, however, we lost 3-1, and that defeat was deserved. We need to make sure we win now after needlessly throwing away two points last week, but it won’t be easy,” Rummenigge said (as captured by Tz’s Vinzent Tschirpke via @iMiaSanMia).

Bayern Munich cannot afford another frustrating result after dropping points last week. Arsenal will present a formidable challenge, particularly with Michael Olise suspended, leaving Kompany with another significant selection headache ahead of a match that could prove crucial to Bayern’s European ambitions.

However, the bigger concern might be whetherKompany can even lead his team from the sidelines.

“We’re missing one of our best players in Michael Olise. We also need to see whether the coach will be able to take his place on the bench. He’s been suffering from a virus since Saturday. Yesterday morning, he seemed to be feeling better, but his condition deteriorated somewhat as the day went on. Perhaps it wouldbe better for him to take the time to recover fully. He is the driving force behind everything we do—and the architect of the success we’ve enjoyed so far,” said Rummenigge.

Rummenigge’s praise highlights just how important Kompany has become to Bayern Munich’s resurgence. Still, with Arsenal waiting and Olise unavailable, Bayern may have to navigate its biggest test of the season without two of its most influential figures.

If Kompany cannot recover in time, his players will need to demonstrate that the mentality and tactical identity he has instilled in this team can withstand adversity. Bayern has the quality to beat Arsenal, but it will need a complete performance to leave London with the result it wants.