The attacking midfielder, who has won 15 caps for France, has already successfully undergone his medical with the Hammers and agreed a five-year contract.
A West Ham statement read: " The outstanding 28-year-old joins the Hammers on a five-year contract, with a further one-year option, for an undisclosed eight-figure fee from French Ligue 1 side Olympique de Marseille."
Source : PA
Source: PA