The pair were signed by the Porcupine Warriors as free agents after their contracts expired with their respective clubs.
Nafiu, a central defender saw his contract ending at Ashantigold while midfielder Opare left Dormaa-based Aduana Stars.
Both players were cleared by the Ghana FA Status Committee today and will begin their three-year deal with Kotoko.
Kotoko will open their Premier League campaign against Liberty Professionals at the Baba Yara Sports Stadium in Kumasi.
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Source: Footballghana.com