The Hammers stunned the Foxes, who went into the weekend at the head of the Premier League table, with a performance which combined defensive solidity with a constant threat on the counter.
"It was an unbelievable afternoon," he said.
"Going into the game, they were at the top of the league, just behind Everton, and in great form. But, look, so are we. That's now three great performances in a row in the league.
"We were unlucky not to take something at Arsenal, we were unbelievable last week against Wolves and on Sunday it was another dominant display."