Bayern lost four of their past five friendly outings, including heavy losses to AC Milan and Liverpool, but despite making heavy weather of the game against Dortmund, Lewandowski is confident they will eventually recover peak form.
The new German video review ran into trouble on its first serious test but despite the embarrassment officials insist it did not decide the Bayern Munich win over Borussia Dortmund in Saturday's Super Cup.
Bayern then won 5-4 after their goalkeeper Sven Ulreich saved two spot kicks in the shootout.
But Ancelotti said he was "proud" of his side's effort as the Bundesliga champions twice coming from behind to secure the win. "I'm pleased. We played with good concentration".
"Of course the title is important". "The pre-season was not good, but you do not have to worry". "We have talked a lot with the coach and the players in the past few days".
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Lewandowski added: "We made a few mistakes but it's the first match of the season".
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Ulreich was equally optimistic after playing the hero in place of Manuel Neuer, who is still recovering from a foot injury.
"We started the game very well, then we lost the thread, but we really moved through to the halfway point", the Turkey worldwide told Dortmund's official website.
"We should have used these [goals] better, and we also conceded two sloppy goals".
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