Simon Moore insists the players will learn from Tuesday's defeat at QPR.
The goalkeeper returned to action, replacing the injured Jamal Blackman in the first half.
After his first appearance of the season, he said: "First and foremost, we are frustrated because we have lost. As players we weren't at our best. You may get away with performances like that in League One, but not in the Championship.
"We will look at it and attempt to put things right at the weekend. We shouldn't get too down, we have to learn from it.
"We have fantastic ability and team spirit and are disappointed with the result, but that shows just how far we have come. We move on and have to look for a positive response."