Real Madrid's Sergio Ramos celebrates after scoring against Napoli. (Reuters)

Arsenal's Olivier Giroud heads over. (Reuters)

Real Madrid's Sergio Ramos celebrates with teammates after scoring against Napoli. (Reuters)

Bayern Munich's Polish forward Robert Lewandowski (2R) celebrates with Bayern Munich's Spanish midfielder Xabi Alonso (C), Bayern Munich's Austrian defender David Alaba, Bayern Munich's French midfielder Franck Ribery (R) and Bayern Munich's Chilean midfielder Arturo Vidal after scoring a penalty during the UEFA Champions League last 16 second leg football match between Arsenal and Bayern Munich at The Emirates Stadium in London on March 7, 2017. (AFP)

Barcelona players celebrate their victory during the UEFA Champions League round of 16 second leg football match FC Barcelona vs Paris Saint-Germain FC at the Camp Nou stadium in Barcelona on March 8, 2017. (AFP)

Arsenal's Aaron Ramsey in action with Bayern Munich's Javi Martinez and Mats Hummels (Reuters)

Borussia Dortmund's Pierre-Emerick Aubameyang celebrates scoring their third goal with team mates (Reuters)

Dortmund¥s players react after the UEFA Champions League Round of 16, 2nd-leg football match Borussia Dortmund v SL Benfica in Dortmund, western Germany on March 8, 2017. (AFP)

Barcelona coach Luis Enrique and Sergi Roberto celebrate after the game (Reuters)

Arsenal's Olivier Giroud (Reuters)

Real Madrid's Alvaro Morata celebrates scoring their third goal (Reuters)

Emerick Aubameyang (L) celebrate scoring the opening goal with his teammates during the UEFA Champions League Round of 16, 2nd-leg football match Borussia Dortmund v SL Benfica in Dortmund, western Germany on March 8, 2017. (AFP)

Arsenal's Alexis Sanchez walks past manager Arsene Wenger as he is substituted (Reuters)

Real Madrid's Sergio Ramos celebrates scoring their first goal with Toni Kroos (Reuters)