Carlos Corberán described Albion's performance at Birmingham City on Friday night as one which "lacked intensity".
The Baggies were beaten 2-0 by the Blues at St. Andrew's with Hannibal and Krystian Bielik both on target for the hosts.
Corberán's men struggled to create goalscoring opportunities and rarely threatened John Ruddy's goal, and the boss was disappointed with the lack of creativity.
Carlos said: "I think that our way to attack today couldn’t beat the way they were defending.
"They were how they were when attacking, they created some problems, maybe not to create enough chances but to make the game the way they wanted to.
"They interrupted the game with a lot of challenges, a lot of second balls and I think it was one game that it takes some time to adapt to, and they surprised us in the first minutes.
"We couldn’t adapt to the intensity of the game. After the surprise of the goal, it created some lack of good management of the game.
"For me, the second goal was massive in the development of the game.”
"In the Championship we know that we always need to play with a high level of intensity, and today it’s true that we didn’t find the way to attack well enough.
"It was one game that we didn’t have the intensity. The second half you analyse the chances and it was set pieces. We conceded two goals today from set piece actions, and if you can’t be better than your opponents you can’t be worse than them.
"The first step of course is the feeling of the defeat. We can’t go to the positiveness of the next game just yet. We need to assess the pain because only from the pain can you improve and be better in the next one.
"We need to use the feeling that we have right now to move to the next one and then the knowledge you have from the game to move to the next one too."