West Ham have added to their forward ranks with the signing of striker Diafra Sakho from Ligue 1 outfit FC Metz.

The Hammers announced on their official website that the 24-year-old had signed a four-year contract for an undisclosed fee.

The Senegalese player has enjoyed a prolific spell at Metz, scoring 43 goals in the last two seasons as the club achieved back-to-back promotions.