The 26-year-old defender believes the Gunners are capable of impressing in European football's elite competition, especially if they keep the back line tight.
"It is very important to defend together," he said of Tuesday night's match against Borussia Dortmund. "We have the quality.
"It is in our head to perform. We have intelligent players and we put the effort in on the pitch.
"We have new players who have arrived at the club, and it is important for us that they can provide some creativity technically in midfield.
"I think we can do something in this competition."