The 26-year old winger has joined the Hammers from Wolves for a club record fee of £10.75million and is looking forward to being a part of such a strong setup in East London.
"I'm delighted to have signed. It's a fantastic club and I'm pleased to be here. It's a great club and it's got great history and tradition," he said.
"I know about Bobby Moore and the history and tradition that go with that.
"I'll be playing with some fantastic players and it'll be great to get into training and I'm looking forward to playing with them. Hopefully I will add a bit of pace, crossing and deliveries that will provide some assists."