Ahead of tonight's opening tie with Villarreal, Raya insists their ambitions for the competition are as large as ever.
“We have belief, we want to win, we are Arsenal and we play to win, that's not a doubt,” Raya said. “That's what we play football for. It's a long journey in the Champions League and the Premier League.
"We have a hell of a group, we have a hell of a team and for this year, we are one more year mature and that is going to make a big difference as well.”
Raya also reflected on his two years with Arsenal.
He said, “I came here to go a step further in my career. I think it was the right decision.
“When I came here, Aaron (Ramsdale) was the goalkeeper and was playing. I just try to do my best on the pitch and off the pitch and give a reason to the boss to pick me.
“I think it was, maybe two years ago that I made my debut, and from there it's been incredible. And having that record, with 42 clean sheets, that credit goes to the team and to the staff.
“Obviously, when I came to Arsenal, there was a lot of noise, a lot of talk outside. Having Aaron, he's an incredible keeper, and out of nowhere, he gets changed.
“There was a few games I could have done better, everyone has bad games, the noise was getting louder. I have to focus on the things under my control, I have to be deaf, basically. Just believe in myself.”