West Ham manager Slaven Bilic insisted two "totally unfair" decisions cost his team against Manchester United.
Sofiane Feghouli was controversially sent off by Mike Dean just 15 minutes into the Hammers' 2-0 defeat after both he and United defender Phil Jones lunged into a 50-50 challenge, with Bilic even feeling the free kick should have been given the other way.
Zlatan Ibrahimovic's clinching goal, scored from an offside position, added insult to injury as United sealed the points.
And Bilic told Sky Sports: "It was never a red card. The other way 'round was the more dangerous one.
"It was Jones -- he got the ball but he went with the 'scissors.' Feghouli very rarely makes a foul in the game and his foot was not high in the air.
"Phil made a meal of it, maybe because he went in a dangerous manner and to save himself. For me that was the crucial decision in the game, it was early and it put the game in a totally different perspective."
Bilic then said in his news conference that he thought Feghouli should not even have been booked, let alone sent off.
"I'm the first one to say referees have a very difficult job but I wouldn't have been happy if it had been a yellow," he said.
"At half-time I didn't want to see the replay but after the game I saw it and it gave me proof I'm right."
He added: "The stakes are so high that it is very frustrating that sometimes your whole season, and your job, depends on one or two decisions and the second goal is clearly offside."
And the West Ham boss was optimistic an appear would go his way.
"We will appeal," he confimed. "I expect at least to win the appeal, which will not make me totally happy but I would be extremely gutted if we have to lose Feghouli for three games."
Bilic also said that the officials should have easily seen that Ibrahimovic was offside before scoring United's second goal.
"That decision and the other one were totally unfair to us and totally wrong," he said.
"It's a big offside because the players are not sprinting. A lot of times we need slow motion, but the players were walking."