Borussia Dortmund coach Edin Terzic admits luck played a role in victory over Chelsea.
BVB won the first-leg of their Champions League round 16 tie 1-0 thanks to Karim Adeyemi's brilliant solo effort.
Terzic said, "It's great to come out on the winning side. There was a little bit of luck involved and we had an exceptional goalkeeper. But there's no need to apologise after winning at home against Chelsea in the last 16.
"I feel like we defended our goal well but made it a little too easy for them to get into the final third at times. If you saw how often we threw ourselves into challenges, how many shots we blocked, Chelsea have an incredible quality up front. But Gregor Kobel is in incredible form and we know when things get tight we can rely on him.
"What we really needed tonight was longer periods of possession. We won the ball well in midfield a lot, but then gave it away again too cheaply. There were a lot of good things, too - the best of which is the result - but we know it's not easy to play against Chelsea and we took a good step tonight."