Midfielder Jack Wilshere maintains Arsenal must not take it for granted they will sweep aside the challenge of Besiktas at the Emirates Stadium next week to secure their place in the Champions League group stages.
The Gunners battled to a goalless draw in the play-off first-leg at the cauldron of the Ataturk Olympic Stadium in Istanbul, where midfielder Aaron Ramsey was sent off late on for a second yellow card and so will miss the return match back in England next week.
Besiktas manager Slaven Bilic insists his well-organised side - who hit the bar right from kick-off through former Chelsea striker Demba Ba - are very much still in contention, although it remains to be seen if the former West Ham and Everton defender will be allowed in the dugout having been ordered to the stands late on by Serbian referee Milorad Mazic.
Wilshere knows Arsenal will have to be on their guard to qualify through to the group stages for what would be a 17th consecutive European campaign.
"It was a hostile atmosphere, but I think we battled well and showed a different side to our game, especially at the end when we went down to 10 men, it was tough, so we did well," Wilshere said.
"They worked just as hard as we did last year to get themselves into this position, so they are not going to just turn up (at the Emirates Stadium) and throw all of that hard work away
"It is not going to be an easy game and we can't take it for granted.
"They are going to come full of confidence from their performance in the first game and we are going to have to start how they did and take the game to them."
Wilshere added: "We always want to be in the Champions League and to attract players who can be in the Champions League.
"We know how big a game it is, and we will treat it as a cup final."