Arsenal defender Laurent Koscielny believes the Gunners know what it takes to beat Borussia Dortmund.
The two teams played each other four times over the last four years with Arsene Wenger's side victorious when the two last met in November of last year.
"We know Dortmund because we've played against them three times and they're the biggest team in Germany after Bayern Munich," Koscielny told the club's official website.
"They have a lot of international players and they're a good team who try to play football with movement.
"Last season we won 1-0 but it was a very hard game because Dortmund played very well.
"They have a lot of players who make the difference.
"They have Aubameyang up front who is very quick, so we know it will be hard.
"We will go to Dortmund with confidence and we want to win the game because it¹s important to start the group stage well."