Steve Bruce was left “frustrated” and “annoyed” by Albion’s performance on Wednesday night as they fell to a 3-2 defeat at home to neighbours Birmingham City.
Scott Hogan scored a hat-trick for the visitors and Bruce says his Baggies side were guilty of not “doing the basics”.
The boss said: “The disappointing thing for me is that we didn’t show up for at least an hour in a derby game.
“We simply didn’t do enough. We didn’t compete well enough, or do all the basics that you need to do in any game of football.
“It’s deeply upsetting.
“In fairness, Blues should’ve scored inside a minute after we made a mistake. You thought that might have woken us up a little bit, but then we go and concede once again inside the opening 15 minutes.
“We were so sloppy. We have to eradicate that.
“We didn’t play until the last 20 minutes. That’s the disappointing thing. We’ve come off second best and the way we’ve come off second best is upsetting.
“We didn’t deal with Deeney well enough. He caused us a physical problem all night.
“We’ve played really well in our last few games here at The Hawthorns, but unfortunately, as has been the case since I’ve been here, we go and throw a performance in like that.
“It’s annoying, it’s frustrating, disappointing and I can understand the frustration of the supporters.”