Borussia Dortmund have suffered a blow after key defender Lukasz Piszczek suffered a lateral collateral ligament injury while on international duty with Poland.
Piszczek, 32, sustained the problem in his right knee during the 4-2 World Cup qualification win over Montenegro on Sunday.
Dortmund 2/1 to win Bundesliga
The right-back has played in all 11 games across all competitions for Dortmund this season, helping them to the top of the Bundesliga, but reports in Germany suggest he is set to be out for a few weeks, pending the outcome of further tests.