The Borussia Dortmund trainer has called on his back line to up its game ahead of the DFL-Supercup clash against Bayern Munich on Sunday
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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 takes on Oberneuland in the DFB-Pokal on August 18, before finally getting its Bundesliga campaign under way on August 24.