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Manchester City's Argentinian striker Sergio Aguero (R) scores his team's first goal 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 / LLUIS GENE (Photo credit should read LLUIS GENE/AFP via Getty Images)

Manchester City's Argentinian striker Sergio Aguero (R) scores his team's first goal 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 / LLUIS GENE        (Photo credit should read LLUIS GENE/AFP via Getty Images)