West Ham manager Manuel Pellegrini was left to rue the match official’s “mistake” in ruling out Lucas Perez’s goal in their 2-2 draw with Leicester City.
The former Arsenal striker replaced Marko Arnautovic in the 78th-minute and restored West Ham’s lead after Jaime Vardy had cancelled out Michail Antonio’s opener.
Perez thought he had scored a second goal late on when he received Pedro Obiang’s through ball and put the ball into the back of the net.
However, the Spaniard’s joy proved short-lived as the referee incorrectly ruled it out for offside even though replays proved he was indeed onside.
Leicester took full advantage of West Ham’s unfortunate setback to claim an injury-time equaliser through Harvey Barnes.
“I’m frustrated because we didn’t get the result we wanted to have here in our stadium,” Pellegrini told Sky Sports.
“Similar to last week [against Man Utd], we deserved to win, but for different refereeing decisions, we couldn’t do it and also because we are conceding two goals.
“It wasn’t a tough decision. Last week was a tough decision [for Felipe Anderson’s goal also incorrectly ruled out for offside], now it is in front of the linesman and Lucas is one metre in the legal position.
“When it is a difficult decision, I say it is a difficult decision. Last week against Man Utd, that was very difficult for the linesman because it was just one foot and it was the opposite side of him – that mistake you can understand.
“But the mistake today, I cannot understand. With that goal, we would have finished the game.”
West Ham remain 11th in the Premier League table after failing to win their past four matches, while Leicester stay in eighth-place for the time being.
Next up for the Hammers will be a trip to London rivals Tottenham next Saturday.