Berlin: Mats Hummels faces a fitness battle ahead of Tuesday`s Champions League clash against Galatasaray after the Borussia Dortmund captain injured his foot in their 2-1 defeat at Bayern Munich.
The Germany centre-back limped off at half-time at Munich`s Allianz Arena on Saturday.
Marco Reus` first-half header for Dortmund was cancelled out by Robert Lewandowski`s second-half strike and Arjen Robben`s late penalty for Bayern.
The defeat leaves Dortmund 16th in the league as they endure the worst start to a Bundesliga season in the club`s proud history after seven points from ten games and five straight defeats.
In contrast, Dortmund have won all three of their Champions League games so far, including a 4-0 romp at bottom side Galatasaray last month to leave them top of Group D.
Another win over the Turkish giants at Borussia`s Westfalenstadion on Tuesday will put Dortmund in the Champions League`s knock-out phase, but Hummels faces a race to be fit.
"It doesn`t look good," said coach Jurgen Klopp. "Mats limped past me in the dressing room with a bandage on his foot.
"He said he felt pain after jumping for the ball, we`ll know more after a scan."