French forward Haller, signed from Eintracht Frankfurt in the close season, put the Hammers ahead in the 24th minute, sliding the ball home from close range after a wonderful cross from Arthur Masuaku.

The goal makes it three goals in two games for the club’s record £45 million (US$55 million) signing who opened his account with a brace at Watford last week.

Norwich, who have now suffered three defeats in their opening four games, should have pulled level in the 31st minute but Todd Cantwell put a header from close range wide, after a superb run down the flank from Max Aarons

Ukraine international Yarmolenko doubled the lead in emphatic fashion with a fine left-foot volley from outside the box in the 56th minute.

Robert Snodgrass should have added a third after being slipped in by Felipe Anderson but his effort was kept out by Norwich keeper Tim Krul.