Dortmund - From pure exaltation to nerve-shattering anxiety, Borussia Dortmund's certainly knows a thing or two about the ups and downs of the UEFA Champions League.

The 25-year-old defender experienced all of the above and everything in between during Wednesday night's 2-1 defeat to FC Zenit and will have to go through it all again next month after BVB progressed to the quarter-finals by virtue of a 5-4 aggregate win.

Here's what he had to say after the final whistle...

Question: Mats Hummels, are you happy just to have made it to the quarter-finals or are you more annoyed to have lost the match?

Hummels: Obviously the positives outweigh the negatives, even if we didn't play the perfect game. Before this round of fixtures, our goal was to progress to the quarters - and we've made it! Of course, we'd have preferred to have done it without those nervy final 15 minutes.

Question: Why didn't it go as well as the first leg?

Hummels: Zenit really loosened up this time, much more than in the first leg. Danny really made a difference in attacking midfield. It was a familiar story for us, though, in that the opposition made the most of a few opportunities. We created more chances, but didn't take them. We created the first chance after five minutes when [Pierre-Emerick] Aubameyang headed wide. Zenit didn't offer much and then stuck the ball away from 30 yards. That made it uncomfortable for us.

Question: Did your heart sink when Hulk smashed home the opener?

Hummels: At that moment we knew that was exactly what we didn't want, but it was a textbook strike from 30 yards - he dug the ball out and hit it well. You could sense the uncertainty until we equalised, but it got better at 1-1. 'Kehli's' [Sebastian Kehl's] goal gave us that extra bit of security, until Zenit made it 2-1 virtually out of nothing.

Question: Did that unsettle you again?

Hummels: In the second half Zenit didn't really put us under that much pressure and for the most part we moved the ball well. For some strange reason, we stopped doing that. Between times, Zenit made it 2-1. That made things a bit uncomfortable for us, but Zenit didn't really threaten to score again.

Question: The atmosphere afterwards wasn't exactly euphoric. Even during the game the fans could be heard grumbling a bit...

Hummels: Obviously expectations levels have risen, both on the part of the team and the fans. Sometimes you can sense an element of unrest in the crowd. It was no different three or four years ago.

Question: Is that part and parcel of BVB's success?

Hummels: Yes, I think it's unavoidable. When you've played a certain way for so long and then you go through a phase like we we've had since December where the consitency has been lacking because of injuries, you have to be prepared for [some unrest]. But the team's attitude has always been spot on.

Question: In any case, BVB are through to the quarter-finals. Who would you like to play?

Hummels: I'd really like to play one of the teams I haven't faced before. Barcelona or Manchester United would be great. I haven't played against Chelsea either, but it doesn't really matter who we get now. We'll be the underdogs against most of them

Frage: Will BVB be the underdogs against all the potential opponents?

Hummels: Because of the personnel situation, you'd have to say we're probably the outsiders. If everyone was available, I'd see things differently. We'll go into the tie as underdogs, but we still have a chance.

Question: The personnel situation doesn't look like getting any better after Marcel Schmelzer was taken off injured against Zenit...

Hummels: I really hope it's nothing bad. It would be typical of our season if he's injured again. We can only hope the medical examination goes well for him. We'll know more on Thursday.

Question: BVB will definitely be without the suspended Robert Lewandowski for the quarter-final first leg. How big a loss will he be?

Hummels: When one of the best strikers in the world is missing, obviously it's a massive blow. But we've had to get on with things all season when players have been missing. Hopefully we'll be able to compensate personnel-wise and tactically, but that's still a long way off. We're not looking any further than our next game [against Hannover 96].

Dietmar Nolte reporting from Dortmund