The Reds conceded twice in the second half to fall to defeat, missing a host of chances in the second period to leave West London empty handed, and Lamouchi was left frustrated by the lack of efficiency in both boxes.
Speaking after the game, he said: “Of course, we are disappointed because the first half was not so bad but we were not good enough to keep the point and not good enough to score in a good time.
“In the second half, the first mistake in the game we conceded the penalty and after that we created two or three clear chances to score.
“We started after the penalty to play more dynamic, more forward in a good rhythm but it was too late and not good enough to get the point.
“We are disappointed to start the league like that, it is not good and we have to work.”
He added: “We know we have to get better, with the ball and without the ball. The last year was our first quality, to defend, be aggressive and compact, all together and today with the first mistake we conceded.
“We need to be more focused, we need to be more consistent and of course, efficient in both boxes. We concede not too much, but enough to lose the game and we created a lot but didn’t score.”