Onyeka is hoping to see the Napoli striker in the Premier League next season.
He told Sky Sports: "He's a really good guy, but he's someone who wants to win, always.
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He doesn't like to lose, not even in training. He always wants to push the players around him, try to encourage them. He is a fighter.
He added: "He is always there to help the team, fight for the team. Even when the team is in difficulty he is the first to push. He never gives up. For me he was one of the best players in the Africa Cup of Nations but people don't really see what he does for us.
"I really hope he comes in Premier League."