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The Poland international has warned his teammates they must improve after they progressed to the Champions League quarterfinals despite a 2-1 defeat to Zenit on Wednesday

Borussia Dortmund forward Robert Lewandowski says his side must improve following a 2-1 defeat to Zenit in the Champions League round of 16 on Wednesday.

BVB progressed 5-4 on aggregate thanks to a 4-2 victory in St Petersburg in the first leg, despite losing on home soil on the night thanks to goals from Hulk and Salomon Rondon.

And Lewandowski, who was booked this evening and will now suffer a one-match suspension, has warned that last year's runner-up must be better in the next round.

"It was not the perfect match by us," he was quoted as saying by UEFA.com.

"We know we need to do a better job than this, but it is only important that we are through to the next round. Unfortunately I will miss the first leg of the quarterfinal due to a suspension."

Teammate Kevin Großkreutz agreed with the Polan international, but expressed his delight at progressing to the quarterfinals and is already eying a meeting with Barcelona.

"We were not compact enough in defense," Großkreutz told Sky.

"Zenit played well, they are a skilled team. But what matters is that we progressed to the next round.

"Barcelona would not be too bad. I've never played against them yet."

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