Arsenal resume their Champions League campaign in Porto on Wednesday night.
Click here or click the image to launch our guide.
Arsene Wenger's team have a host of injury problems, but will be desperate to return with a positive result.
Here, we take a look at where the match may be won or lost at the Estadio do Dragao.
Subscribe to Independent Premium to bookmark this article
Want to bookmark your favourite articles and stories to read or reference later? Start your Independent Premium subscription today.
Join our commenting forum
Join thought-provoking conversations, follow other Independent readers and see their replies