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Sporting's Algerian forward Islam Slimani celebrates a goal in front of Porto fans during the Portuguese league football match FC Porto vs Sporting CP at the Dragao stadium in Porto on April 29, 2016. / AFP / FRANCISCO LEONG (Photo credit should read FRANCISCO LEONG/AFP via Getty Images)

Sporting's Algerian forward Islam Slimani celebrates a goal in front of Porto fans during the Portuguese league football match FC Porto vs Sporting CP at the Dragao stadium in Porto on April 29, 2016. / AFP / FRANCISCO LEONG        (Photo credit should read FRANCISCO LEONG/AFP via Getty Images)