Son said: "We're still a little bit inexperienced because we're building a young team, some of them are in their first season in the Premier League.
"So look, we can test ourselves against one of the biggest teams in Europe and the Premier League. But also in the world.
"So I think it's very important the way we play: stick to our (style of) play, stick to our game. I think it's a very, very good test. As I said, it's against one of the best teams in the world so it's perfect (for us). You want to always have good competition and you always want to face the best teams in the world."
He added: "Every single game is big for me and a chance to show how impressive I can be. It's not important who scores the goals or that I scored previously in this game. I just need to be ready for the biggest game of the season.
"It's a big derby and we know what it means for the team and the club and also for the fans. So we're going to prepare well and play our style of game."