The Nigeria international has scored just once in the Premier League this season and departs Vicarage Road for the Far East
Watford have confirmed the departure of striker Odion Ighalo to Chinese outfit, Changchun Yatai, for a fee of around £20 million.
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The Nigeria international impressed for the Hornets last season, but has fallen down the pecking order under Walter Mazzarri.
Having joined the Vicarage Road outfit from Granada in 2014, he scored 20 goals as Watford won promotion back to the Premier League in 2014-15.