Roura says they'll be confident playing the return-leg at the Nou Camp.
"It's a good result," said Roura. "We're a bit sad with the result seeing how the match played out, we had the game won despite the adversities.
"We're going to approach the return leg like we always do, we have to try to score to make the match more difficult for them; they feel the weight of the stadium and of our fans. We will go out to win the match."
On the injuries suffered by Lionel Messi and Javier Mascherano, he added: "We'll find out how serious the injuries are, I think that's the most important thing. Messi has a small issue with his hamstring and we don't know how severe it is and Mascherano sustained a MCL tear in his right knee.
"If they can't play it will be negative for us, but other players will step up and they will prove why they deserve to be here. We have a deep roster."