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Sporting's Algerian forward Islam Slimani (bottom) celebrates a goal with teammate midfielder Joao Mario during the Portuguese league football match FC Porto vs Sporting CP at the Dragao stadium in Porto on April 30, 2016. Sporting won the match 3-1. / AFP / MIGUEL RIOPA (Photo credit should read MIGUEL RIOPA/AFP/Getty Images)

Sporting's Algerian forward Islam Slimani (bottom) celebrates a goal with teammate midfielder Joao Mario during the Portuguese league football match FC Porto vs Sporting CP at the Dragao stadium in Porto on April 30, 2016. Sporting won the match 3-1. / AFP / MIGUEL RIOPA        (Photo credit should read MIGUEL RIOPA/AFP/Getty Images)