West Ham boss Avram Grant refused to criticise Mark Clattenburg despite claiming the referee made a crucial 'mistake' late on in their draw with Wolves.
Frederic Piquionne had the ball in the net in the last minute of stoppage time of the 1-1 draw at Molineux on Saturday, only to be penalised for handball.
The striker was adjudged to have used his arm rather than his chest, before stabbing past the onrushing Marcus Hahnemann in Wolves' goal.
Grant rates Clattenburg highly and felt he had a solid performance, only to somewhat undo his good work with a decision against his side deep in added time.
"We started the game really well, for ten minutes we dominated then they scored and they were better than us for the rest of the first half," Grant told Sky Sports.
"The second half was much better. We dominated the half and scored two goals, one the referee decided it was not a goal.
"Mark is a very good referee, I must say, but also he's a human being, he made a mistake, it happens and unfortunately it has happened against us.
"Of course it was a goal, but it happens."
A Mark Noble penalty cancelled out Matthew Jarvis' opener in a classic tale of two halves between the Premier League's bottom two clubs.
West Ham remain bottom of the table but their second-half display has given Grant a boost and he feels his side are improving both mentally and physically as the season progresses.
"We are improving a lot," he said. "We are working on the mental things very hard and when you see the result here we are happy.
"On one side, we say okay we are happy, because we were 1-0 down but I think we played the second half to win and we deserved to."
Hammers defender Matthew Upson suffered a setback in the build up to the game, withdrawing from the squad with a back complaint, but Grant is yet to reveal the extent of the injury.
He said of Upson: "He had a back problem and a neck problem, he couldn't move his neck. It was a last moment thing, but the defence played well."