Dortmund lost in the final of the Champions League at the weekend and are set to lose Mario Gotze and Robert Lewandowski this summer.
“I have read that we have a difficult season ahead of us, which doesn’t make sense because we have such a good base and such good quality,” he told Bild.
“Naturally, there will be a couple of changes and one or two players will leave. But breakup is the wrong word, there are simply a few changes which we think we can use to our advantage. I’m quite positive.
“I can promise that everything will work out in the end. We are building a new team, a new pressing machine.”
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Liverpool have unveiled their new home kit for next season, sticking with the hugely popular retro styling of the current shirt.
The reputation of the Premier League means it is the most popular and one of the most watched leagues in the world.