Leicester boss Brendan Rodgers to BBC Sport: "Everything was missing - it was poor. We started the season well and scored goals but we lacked aggression in our defending and West Ham have shown they are a good side.
"We rushed the game and then gave away two poor goals, it gave us a mountain to climb. They deserved to win, they were good defensively and on the counter-attack.
"We didn't see the performance coming from us. We have nine points from 12 and we will take that, but today is what can happen in football.
"Dennis [Praet] and James Maddison [both injured] give us extra quality and we lacked precision in our passing. We couldn't get our front players involved and didn't give the back line a chance to get up the pitch."
West Ham assistant boss Alan Irvine to BBC Sport: "From start to finish the players did a fantastic job in and out of possession. It was everything we asked for. It is all well and good to do this on the training ground but they have to make it happen [in the game]. Everyone did a fantastic job.
"This club needs to be looking up rather than down. Too often we have been looking over our shoulder. I'm not saying we are there yet but we are making steps towards that.
"We should have got something at Arsenal and [the result at] Wolves was great, but it doesn't matter much if you don't follow it up."