Okoye has joined Watford on-loan from Sparta Rotterdam.
He told Transfermarkt: "My management had been in contact with several clubs since the beginning of this year.
Okoye will join Watford on January 1 and added: "I want to get to the top and stay there. This is a great league with great clubs, fans and players and it takes a lot to survive in this league and be in the starting lineup. But I needed the next step to keep growing as a player and as a person."
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