The Nigeria international, after last season's successful loan, has joined Gala in a permanent transfer from Napoli.
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Montella, who is also a former Adana Demirspor coach, said: "He has shown great determination in wanting to play here, fighting with Napoli for a transfer.
"As a young player and already at international level, he can pave the way for other talents who want to join Turkish clubs. It's certainly encouraging to see players of this quality arrive."
Meanwhile, on his own contract, Montella added: "My contract renewal has put a stop to a lot of speculation. It was a mutual desire to continue together. I'm happy here and really wanted to continue my journey."