Barcelona's Lionel Messi, left, celebrates after scoring the opening goal during the soccer Champions League round of 16 first leg soccer match between Arsenal and Barcelona at the Emirates stadium in London, Tuesday, Feb. 23, 2016. (AP)
Arsenal's French defender Laurent Koscielny (L) vies with Barcelona's Argentinian forward Lionel Messi during the UEFA Champions League round of 16 1st leg football match between Arsenal and Barcelona at the Emirates Stadium in London on February 23, 2016.
(AFP)
Barcelona's Lionel Messi, left, tackles Arsenal's Danny Welbeck during the soccer Champions League round of 16 first leg soccer match between Arsenal and Barcelona at the Emirates stadium in London, Tuesday, Feb. 23, 2016. (AP )
Arsenal v FC Barcelona - UEFA Champions League Round of 16 First Leg - Emirates Stadium, London, England - 23/2/16 (Reuters)
Barcelona's Lionel Messi, left, tackles Arsenal's Danny Welbeck during the soccer Champions League round of 16 first leg soccer match between Arsenal and Barcelona at the Emirates stadium in London, Tuesday, Feb. 23, 2016. (AP )
Arsenal v FC Barcelona - UEFA Champions League Round of 16 First Leg - Emirates Stadium, London, England - 23/2/16
Barcelona's Gerard Pique brings down Arsenal's Danny Welbeck resultin in a yellow card to Pique
(Reuters)
Bayern Munich's Polish forward Robert Lewandowski (R) challenges Juventus' Swiss defender Stephan Lichtsteiner during the UEFA Champions League round of 16 first leg football match between Juventus and Bayern Munich at the Juventus Stadium in Turin on February 23, 2016. (AFP)
Bayern Munich's Brazilian midfielder Douglas Costa (R) kicks the ball past Juventus' Swiss defender Stephan Lichtsteiner during the UEFA Champions League round of 16 first leg football match between Juventus and Bayern Munich at the Juventus Stadium in Turin on February 23, 2016. (AFP)
Juventus' Italian defender Andrea Barzagli and Juventus' French defender Patrice Evra (L) challenge Bayern Munich's German midfielder Thomas Mueller (C) during the UEFA Champions League round of 16 first leg football match between Juventus and Bayern Munich at the Juventus Stadium in Turin on February 23, 2016. (AFP)
Bayern Munich's Polish forward Robert Lewandowski (L) heads the ball with Juventus' Swiss defender Stephan Lichtsteiner during the UEFA Champions League round of 16 first leg football match between Juventus and Bayern Munich at the Juventus Stadium in Turin on February 23, 2016. (AFP)