Follow Mail Sport's live blog of Arsenal vs Porto in the Champions League as Mikel Arteta's men bid to overturn a 1-0 deficit at the Emirates, plus updates of Barcelona vs Napoli.
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Last time out
Arsenal came unstuck in Porto last month in the fourth minute of stoppage time, after looking poised to secure solid goalless draw in the away leg.
The Gunners had escaped early in the match when Galeno crashed an effort onto the post before firing the rebound wide with the goal gaping.