The Gunners go to Munich needing to overturn a 2-0 deficit.
"Last season we went there 3-1 down and everyone wrote us off but we managed to get a good 2-0 win there," said Oxlade-Chamberlain. "We'll be feeling we can take something from that and in football a lot of things can happen.
"There is a 100 per cent chance we can do it. We are a top side, they will know the job's not done and we know the job's not done."
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