Al-Khelaifi said: "It's magnificent. We were waiting for this moment. We are a great club. We are here to go as far as possible. We played a great game here, it is not easy. We lost the first game, they criticised us a lot, but I had a lot of confidence. We won this match because we were prepared for this moment.
"We want to continue on the same path. Keep calm, celebrate tonight. We are in the semi-finals, but the Champions League is very difficult and all the details count."
The Qatari also had some words for his coach, Luis Enrique: "I spoke to him before the game. I told him that I wanted us to qualify. I have a lot of confidence in him. I also want to thank the fans, we felt at home. A semi-final of the Champions League is difficult. We want to prepare well. But the coach knows Dortmund well."