West Brom boss Slaven Bilic was left frustrated after their 1-0 defeat at Manchester United.
Bruno Fernandes' twice-taken second-half penalty was enough to give United their first Premier League victory of the season at Old Trafford over a battling West Brom outfit.
Bilic said: "We played well. We had a few chances to score. We were there. I told the guys I'm disappointed, I think we deserved something.
"We deserved to go in front in the second half. I told them to stay positive and stay and fight and train and we'll win games."
On Conor Gallagher's penalty call being overturned, Bilic stated: "I'm very disappointed with the decision. I felt like 'small West Brom'. All those crucial decisions went against us. I've watched it a few times and it's a clear penalty. I don't understand why he overturned it."
On United's penalty, he added: "It's a handball. It's a bit unlucky but it's handball. Before that it was a clear foul on Conor Gallagher. Instead of 1-0 for us, it's 1-0 for them. When you play against Manchester United away it's a huge difference."