The draw means that Dortmund have a tricky home game against the Spanish side next week for a place in the last four.
“We produced a good performance for an away match and created several decent chances,” said Gundogan.
“Mario [Gotze] had three or four and he usually puts at least one of those away. It wasn’t meant to be but it was also important to keep a clean sheet.”
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Chelsea have struggled to build momentum in the opening stages of the campaign and are currently looking over their shoulders at the relegation zone.
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