The Hammers, who have been scouring the market for a striker in January, paid a fee of £730,000 to sign the 28-year-old from Fenerbahce, the club confirmed on Sunday.
Speaking after he was unveiled by the club, Emenike says he’s looking forward to working with manager, Slaven Bilic whom he has known from his time in Russia.
“I’m very, very happy and very, very excited that I’m here,” Emenike told West Ham TV.
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“I have always known West Ham as a great club. I’ve always been watching them. West Ham’s a great club and I’m happy to be here.
“I’ve known him [Bilic] for years. When he was at Lokomotiv Moscow, I was at Spartak Moscow, then he came to Besiktas and I was in Fenerbahce, so we’ve known each other for a long time. I’m happy to be here and happy to play for him.
“We’ve followed each other’s careers and thank God we are here today and we are here together,” he concluded.
The Nigerian has played 37 times for his country, scoring more than 80 goals at club level, including seven this season on loan at Al-Ain in the United Arab Emirates.
In 2013 he helped Nigeria win the Africa Cup of Nations, finishing as the tournament’s top scorer with four goals, and he also played for the Super Eagles at the 2014 World Cup.