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Barcelona's Brazilian defender Adriano (2R) fouls Manchester City's Argentinian striker Sergio Aguero (R) during the UEFA Champions League round of 16 first leg football match between Manchester City and Barcelona at the Etihad Stadium in Manchester, northwest England, on February 24, 2015. AFP PHOTO / PAUL ELLIS (Photo credit should read PAUL ELLIS/AFP via Getty Images)

Barcelona's Brazilian defender Adriano (2R) fouls Manchester City's Argentinian striker Sergio Aguero (R) during the UEFA Champions League round of 16 first leg football match between Manchester City and Barcelona at the Etihad Stadium in Manchester, northwest England, on February 24, 2015.  AFP PHOTO / PAUL ELLIS        (Photo credit should read PAUL ELLIS/AFP via Getty Images)