Manuel Pellegrini bemoaned Leicester City's late equaliser as 10-man West Ham were denied in the final minute at the King Power Stadium.
Wilfred Ndidi's speculative effort from 25 yards deflected off Fabian Balbuena's back to beat the impressive Lukasz Fabianski for a share of the spoils.
Balbuena had earlier given West Ham the lead with his first goal for the club, only for Mark Noble to be shown a red card for a tackle on Ndidi.
"I think we were very unlucky. We defended so well for the whole game but particularly for the 55 minutes with one player less. At times, it was a masterclass in defending from us," he said.
"When it was 11 against 11 most of the game was in their half and we dominated. We must continue working and we are unlucky with the goals we are conceding. Leicester is always a difficult stadium to win in."
On Noble sending off, he added: "I haven't seen the action yet so I can't give my opinion but I will say what I always say when those things happen, it is the decision of the referee.
"Mark told me he had no bad intentions and he tried to get the ball, but maybe he arrived late."
