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PORTO, PORTUGAL - AUGUST 17: FC Porto's forward Andre Silva tackled by AS Roma's defender Thomas Vermaelen from Belgium during the UEFA Champions League match between FC Porto and AS Roma at Estadio do Dragao on August 17, 2016 in Porto, Portugal. (Photo by Gualter Fatia/Getty Images)

PORTO, PORTUGAL - AUGUST 17: FC Porto's forward Andre Silva tackled by AS Roma's defender Thomas Vermaelen from Belgium during the UEFA Champions League match between FC Porto and AS Roma at Estadio do Dragao on August 17, 2016 in Porto, Portugal.  (Photo by Gualter Fatia/Getty Images)