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 in a deal worth a reported ??10.7million.
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.”
“West Ham really showed me that they wanted me to come, both the Joint-Chairmen and the manager,” Payet told West Ham’s official website.
“That???s very important for me. I was also keen to sign up to a clear project. West Ham???s is very interesting and matches perfectly with my ambitions. ????
“Firstly I spoke with the manager, who really wished for me to come here and had been watching me a lot. He made it clear that he wanted me to sign and that too was important in my choice.??
“I’m an attacking footballer so for sure I like attacking football and that they???re counting on me to help achieve that gives me a sense of responsibility. The fact that I???m here is also down to that.
“I’m very happy to be here. It???s true that it???s taken a little while but that???s normal, negotiations are like that. But now that it???s done, I???m very happy.”