BVB Dortmund forward Marco Reus will be out of action for two weeks with the groin injury he sustained against Qabala in the Europa League on Thursday.
The Germany international opened the scoring for Dortmund in their 4-0 win at Signal-Iduna Park, but was forced off at half-time after tearing his muscle in a challenge.
Scans have revealed the extent of the problem, which will keep Reus on the sidelines until after the next international break. He sits out the derby clash with Schalke 04 on Sunday as well as Germany's friendlies against France and the Netherlands.
The 26-year-old has already spent four weeks on the treatment table this season with various injuries, which saw him miss four games for Thomas Tuchel's side.
BVB head coach Thomas Tuchel said: "He lost his balance in a challenge and felt a pull in the groin area. That happened shortly before he scored our first goal.
"He wanted to continue playing until half-time. The injury is in a different location to the previous problems."