The 26-year-old ‘keeper completed a medical this morning and has agreed a 4-year deal with the Hammers.
Green made over 200 appearances for Norwich City in his 7 years at the club and has also been regular member of the England squad for the last 2 years.
Robert is still currently sidelined by a groin injury picked up in an England B international but has started light training and will start to compete with Roy Carroll for the number 1 jersey.