Arthur Masuaku was sent off as West Ham were held 0-0 by Aston Villa on Monday Night Football.
The left-back was given his marching orders by referee Mike Dean with just over 20 minutes remaining after picking up his second yellow card for a foul on Ahmed Elmohamady, who went down easily.
The red card was Dean’s 102 in the Premier League and Manuel Pellegrini disagreed with the decision.
“It was a typical sending off when you play away, with the pressure of the fans in every foul,” he said.
“We played with 10 men exactly the same as 11,” said Hammers boss Pellegrini. “I’m very happy with the personality and performance. If you cannot win, don’t lose it.
“We did a complete game. I want to see in every game the attitude we saw tonight. I’m happy with the way we’re improving.”
It could easily have been the home side who were down to 10 men as two of Villa’s own players clashed towards the end of the first half.
Tyrone Mings was furious with Anwar El Ghazi’s lack of defensive effort and the Netherlands winger responded by nudging his head into Mings’ face.
He could have been sent off, but referee Dean and the video assistant referee decided the contact was not sufficient to produce a red card.