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The Borussia Dortmund trainer has called on his back line to up their game ahead of the DFL-Supercup clash against Bayern Munich on Sunday

Borussia Dortmund coach Jurgen Klopp has told his defence that they must improve as the German champions gear up for the start of the season.

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Die Schwarzgelben stuttered to a disappointing 3-3 draw against Werder Bremen in the annual pre-season LIGA Total! Cup before losing on penalties.

And with Sunday's DFL-Supercup match with Bayern Munich approaching fast, the 45-year-old has warned them that such shoddy displays will not be tolerated.

"I wanted them to take on board the things we have done in training," he told Bild. "I have seen nothing of the sort with the defence. That's not right.

"This has taught me an important lesson. We had no security. We do not have much to do, but we are preparing."

After taking on Jupp Heynckes' side, Dortmund take on Oberneuland in the DFB-Pokal on August 18, before finally getting their Bundesliga campaign under way on August 24.

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