As West Ham took a significant stride towards the Europa League knockout stage with victory over Genk, forward Jarrod Bowen said "teams will be fearing us".
David Moyes' side maintained their 100% record after three games and comfortably sit top of Group H, six points clear of second-placed Dinamo Zagreb, who were beaten 2-1 at Rapid Vienna.
The Hammers had the majority of the possession but barely threatened in the first half until Craig Dawson looped home a header from Aaron Cresswell's cross on the stroke of half-time.
They took total control with two goals in the space of two minutes just before the hour mark.