Borussia Dortmund will be without Mats Hummels for four weeks after the defender suffered an ankle injury during the side's 2-1 derby defeat at Schalke.

Hummels, 24, who had just come back from a bout of flu which had ruled him out for ten days, suffered a partially-torn ankle ligament just 30 minutes into the match at Gelsenkirchen.

With 15 minutes still left in the first half, however, the Germany international failed to signal his injury to the bench and decided to carry ...

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