The Gunners finished top of Group A after an interesting turn of events in the final match of the group stages.
Arsene Wenger's side were 4-1 winners at FC Basel, to put them onto 14 points.
Meanwhile Paris Saint-Germain, who entered the evening in the driving seat, drew 2-2 with Ludogorets at the Parc des Princes, meaning Unai Emery's side finish runners up on 12 points.
But how important is finishing top?
Here's who Arsenal could draw in the last 16, based on current standings:
Because they finished top of Group A
Benfica, Bayern Munich, Bayer Leverkusen, Real Madrid, Porto, Sevilla
Here's who are 'definite possible' opposition because Arsenal won Group A (ie.