The two sides will meet on Thursday for the Europa League semi-final first leg in Spain on Thursday.
Speaking at an event for LiveScore, Chukwueze said: "When the time comes, it will be up to the coach and the tactics he chooses – all I need to do is just enter the field using the skills I have practiced and give everything I have.
"We are going to play our football as normal. We are not scared or anything, we are just going to play our football as a team."
The match is also a reunion between Unai Emery and the Gunners.
Asked about Emery as a coach, Chukwueze added: "I enjoy playing under Unai Emery. He's amazing, and so tactical in everything he does.
"He can push you to the limit, but he is a fantastic coach.
"He has an amazing football brain. He has amazed me how I have seen him change things from game to game.
"Sometimes when I watch him from the bench, I have looked at him and noticed changes he makes which work for him that are great to see. He is so good at his job and is a fantastic coach."