Watford have sold Nigeria striker Odion Ighalo to Chinese Super League side Changchun Yatai for a reported £20m.
Ighalo, 27, joined the Hornets in 2014 from Italian side Udinese and helped Watford win promotion to the Premier League in the 2014-15 campaign.
He scored 15 top-flight goals in 2015-16, but has only one Premier League goal this season and has gone 15 games without scoring in all competitions.
Watford are 14th in the Premier League, eight points above the relegation zone.
During his time with the Hornets, Ighalo played 100 times in all competitions and scored 39 goals.