Sky Sports News reports that sources close to the player himself have told he would be willing to listen to offers from Premier League clubs
Sky Sports understand two Premier League clubs have made contact with the striker’s representatives.
The 28-year-old joined Chinese side Changchun Yatai last year and has three years left on his contract plus a £20m release clause.
The Nigerian International joined Watford in 2014 after spells in Udinese and at Cresena and Granada
He scored 16 goals in 55 appearances in the Premier League for the Hornets.