He told the Hammers website: “I’m delighted that the deal has now been done and it feels great to be a West Ham United player.
“I’m now looking forward to being a part of the Club, getting out on the pitch, and getting my foot in to try and help us out of this position.
“As soon as I heard that West Ham were interested, I thought to myself: ‘I’d like to be a part of that.’ Having met Alan Curbishley and the Chairman, I can see the direction the Club is going in, and I fully believe that the squad here is capable of achieving the success they want.
“The easier option would have been to stay at West Brom and try to keep us up there in the Championship with a chance of promotion but I looked at the situation here and saw it as a Club who can go on to bigger and better things in the future if we can stay in the Premiership this year.”
He added: “I’m under no illusions about the task ahead, but throughout my career, I’ve faced certain challenges and met them all in the same way – by trying to do the very best I can and giving as much commitment and determination as possible.
“I do feel that I’ve perhaps got more desire and hunger in me now than when I was a lot younger, and I’m determined to establish myself as a Premiership player. It’s a fantastic opportunity for me at West Ham and I can’t wait to get started.”