David Raya saved two penalties as Arsenal beat Porto 4-2 in a shoot-out to reach their first Champions League quarter-final in 14 years.
Barcelona manager Xavi Hernandez found himself in the limelight as he discussed the team's recent 1-1 draw against Napoli in the UEFA Champions League.
Barcelona faced a golden opportunity in their Champions League round of 16 first-leg clash against Napoli, but squandered it on Wednesday.
Mikel Arteta bemoaned a lack of aggression from his Arsenal side in the Champions League defeat at Porto.
Manchester United's European campaign is over after Kingsley Coman fired already-qualified Bayern Munich to a 1-0 victory that meant Erik ten Hag's men finished bottom of their Champions League group.
Arsenal's much-changed side were lucky to leave the Netherlands with a 1-1 draw in their dead-rubber Champions League tie against PSV Eindhoven.