On Tuesday, RB Leipzig were handed some horrible news in regards to right-back, Lukas Klostermann.
The promising young defender was confirmed to have torn the anterior cruciate ligament (ACL) in his right knee without sustaining any challenge.
The club say he will be out for "several months" and wished him well with his recovery, saying: "We wish you a speedy recovery, Luke, we are all behind you!"
Rapid recent rise
A product of the VfL Bochum youth academy, Klostermann went on to make nine appearances for the Ruhrpott club as a teen before being snapped up by Leipzig.
Since then he has gone on from strength to strength, establishing himself on both the domestic and international scenes.
His first season at the club yielded 13 2. Bundesliga appearances, though he quickly improved upon that in his second term once settled in the east.
Klostermann missed just four games in Leipzig's historic promotion campaign, as they earned a Bundesliga berth for the first time in their short existence.
He starred during Germany's run to Olympic silver in Rio this summer, and was set to make his impact on the Bundesliga this season but that has been cut short.
Who can replace him?
Benno Schmitz will step into Klostermann's shoes but he is not quite up to speed with the Bundesliga yet, nor does he offer the same defensive stability as his team-mate.
Klostermann's injury also takes away possible centre-back cover, but also leaves the team with just one right-back in the squad.
That means Diego Demme will most likely play as back-up to Schmitz, while still maintaining his role beside Stefan Ilsanker in midfield.
What Ralph Hasenhüttl opts for remains to be seen, but we will find out on Saturday as Leipzig make the trip to the Volksparkstadion to take on Hamburger SV.