Hummels is a doubt for Dortmund's game with Werder
Borussia Dortmund are waiting to discover the extent of the injury that Mats Hummels picked up on Sunday.
Mats Hummels is a doubt for Borussia Dortmund's game against Werder Bremen on Saturday.
The experienced centre-back was forced off with an injury during the second half of BVB's 2-2 draw with Eintracht Frankfurt on Sunday.
"He had problems with his back and couldn't really turn. But there is no diagnosis yet. We have to wait and see," Dortmund coach Lucien Favre told reporters after the game on Sunday.
Hummels has made seven appearances for Dortmund since returning to the club from Bayern München in the summer.