Kepa saved superbly against Carlos Baleba and Georgino Rutter on the night.
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He said: "I played a friendly game in the summer, but it was my first official game here in front of our fans. I'm really happy because everything went well; we kept a clean sheet, we got a win, so it was a perfect night."
Kepa also said: "We have to keep going. We know how hard the league is, Champions League, cup games, a lot of games, so we have to stick together. We have a big squad, we have to be available, all of us.
"We have to push each other because it's going to be a long season and we have to take this momentum and keep it going."