West Brom assistant coach Nigel Gibbs said his players responded well to Ryan Mason's dismissal during their 1-1 draw at Portsmouth.
The Baggies were held at Fratton Park when Colby Bishop cancelled out Mikey Johnston's opener.
But Mason was sent off for dissent in the second half after his side weren't given a penalty.
"From where I was it looked a penalty, as did the crowd – everyone in the stadium thought it was a penalty – they didn't. It's frustrating, disappointing what went on. That's football," Gibbs told BBC Radio WM.
"The boys really responded well after that which was the most important thing.