The player, 25, has passed medical checks and the deal was officially announced by the Istanbul giants on Monday, reports Efe.
Josue was not in the plans of Porto coach Nuno Espirito Santo for next season.
Josue, who began with the Dragons, played previously for several Portuguese clubs such as Sporting da Covilha, Penafiel and Pacos de Ferreira, as well as Dutch side VVV-Venlo.
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