Borussia Dortmund will be without Axel Witsel when they play Hertha BSC on Saturday.
The Belgian midfielder has picked up a muscle problem and will also miss the international break.
“Axel Witsel has a hamstring injury, unfortunately,” head coach Lucien Favre told reporters on Thursday.
“We hope Witsel is back after the international break.”
Witsel has been crucial to Dortmund’s title challenge, starting 24 of the team’s 25 Bundesliga games so far this season and appearing as a sub in the other.
Dortmund are currently level on points with Bayern Munich at the top of the Bundesliga table. The two teams meet in Munich on 6 April.