Alex Oxlade-Chamberlain is confident that Arsenal can "finish the job" by beating Besiktas to qualify for the Champions League group stage.
The Gunners claimed a hard-fought goalless draw in the first leg and know a victory on Wednesday night would secure their progress.
The England international says keeping a clean sheet in Istanbul was essential, but admits the Gunners must improve their attacking play against the Turkish side.
"I think we're capable of more going forward"
"On the day [in Istanbul] it didn't happen but it left us in a great position to finish the job off,” Oxlade-Chamberlain said.
"I definitely think we can take confidence from that game. It wasn't the result we were going there for, we would love to have gone there and won but 0-0 gives us a good opportunity.
"I think the fluidity in the first-leg performance wasn't at its highest, it wasn't a terrible performance but I think we're capable of more going forward.
"We need to defend well to start off with and the main thing is to match them physically and competitively because they are going to come at us hard because they really want to qualify for this.
"There are improvements but we're discussing that as a team and we know ourselves what we need to do and it's just about approaching it in the mindset to finish the job."
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