Lopez, Joao Cancelo and Robert Lewandowski struck as Barca reach the quarterfinals 4-2 on aggregate.
Lopez later said: "That's four years this club has waited to qualify for the quarter-finals of the Champions League this means real joy for the squad, the coach, the injured players, the fans.
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"It was important that we started this match really well. We had some chances and, after a few hits on goal, mine went in. I'm very happy with that.
"We always believed in our coach. We've felt a sense of liberation because he's taken the pressure off everyone, he's brought tranquility to a tough situation. Tonight the stadium was full and we really felt the force of our fans. We're delighted to be through - it's not time to think about the draw right now."