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Porto's Spanish goalkeeper Iker Casillas (L) catches the ball next to Uruguayan defender Maxi Pereira and Chelsea's Brazilian-born Spanish striker Diego Costa (R) during the UEFA Champions League Group G football match at the Dragao stadium in Porto on September 29, 2015. AFP PHOTO / FRANCISCO LEONG (Photo credit should read FRANCISCO LEONG/AFP/Getty Images)

Porto's Spanish goalkeeper Iker Casillas (L) catches the ball next to Uruguayan defender Maxi Pereira and Chelsea's Brazilian-born Spanish striker Diego Costa (R) during the UEFA Champions League Group G football match at the Dragao stadium in Porto on September 29, 2015.  AFP PHOTO / FRANCISCO LEONG        (Photo credit should read FRANCISCO LEONG/AFP/Getty Images)