The Gunners reached the quarter-finals, following their 7-6 penalty shoot-out victory over Roma on Wednesday.
The full-back told L’Equipe: “We are really exhausted after the match at Roma. We had a lot of difficulties, but it was essential that we progressed.
“Could we win the Champions League? Yes, I really think so. I am confident.
“We have discovered a new side to the team this season. We defeated Manchester United, won at Chelsea and drew against Liverpool.
“If we can keep that state of mind, we can be successful.”
