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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Since Guus Hiddink arrived at the helm, Chelsea have improved considerably after a tricky start to the campaign.
Newcastle United are staring down the barrel of relegation to the Championship for the second time in the past eight years.