Delap's goal also marked a first in the Champions League for the centre-forward.
After the 3-0 win, he said afterwards: "It was incredible.
"You grow up dreaming of nights like this, so it’s a very special moment for me. We had a game plan, and everyone executed it really well. I thought it was a great performance and a great night for everyone involved.
"I believe we’re building something really good here. We’re working together every day, and we’re getting better and better. We come into every game with huge belief. Today, we showed that we can do it against anyone."
He continued: "We knew how strong Barcelona are and how many good players they have, but we also knew that their high line is so high, and we knew that we needed to be defensively solid, and that we could hurt them. Defensively, everyone was really solid.
"We had to pass the ball about to create that space, and I think everyone should be really proud of themselves.’
Estevao was also on the scoresheet and Delap added: "He’s so young, but he’s so exciting. He’s so raw, and he’s got the world at his feet at the moment. He’s just got to stay grounded and keep working hard."