Riccardo Calafiori proved the matchwinner on Sunday, though Raya was named man-of-the-match after making seven major saves through the game.
"It's a great start in terms of points," Raya told arsenal.com. "In terms of a difficult place to come, away from home to Old Trafford and get the three points and a clean sheet. B but we know it wasn't good enough with the ball and we made a lot of mistakes, so there's a lot of things to improve, but I'm happy to get the three points and start with a clean sheet."
"We know coming to this place how important it is to be alert" Raya added, "and try to do my job and help the team and I think I did that and tried to help the team as much as possible and we got the three points and the clean sheet, that was the main thing.
"That's the willingness, the fight, the spirit that we have altogether, where things are not going our way and we make mistakes, everybody's sprinting back and trying to help the teammate that's made a mistake to recover the ball and to do the right thing. So we did that and I think we dug deep very, very well, especially the last 10-15 minutes where they threw everything to us and we defended very well, so that's credit to the team."