How does it work?Thirty-six sides entered into the new "league phase," with 16 remaining following an exciting playoff round that saw Manchester City bounced by Real Madrid and Celtic put a scare into Bayern Munich.

Champions League quarterfinals feature eight of Europe's best teams still competing for the most coveted trophy in club soccer.

The Gunners cruised into their second successive quarter-final with a 9-3 aggregate win over PSV Eindhoven at the last-16 stage, a result owing much to their 7-1 first leg win. Meanwhile, the holders beat their city rivals Atletico Madrid on penalties to set up a blockbuster tie next month.