The Mexico forward only signed for the Ukrainian outfit in the summer in a lucrative £15million deal from Olympiacos, but after failing to impress he will now join Sven-Goran Eriksson´s squad in January.
City chief executive Alistair Mackintosh said: "Nery Castillo´s desire to make this deal happen has been extraordinary. We are excited and delighted that another young established international has joined the football club."
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