GARY Rowett wants to see a reaction to the 1-0 defeat at Wigan when his side face Birmingham at The Den on Wednesday.
Millwall boss Rowett thought his side were too passive in their disappointing loss to Paul Cook's relegation strugglers.
The Lions face Blues and Bristol City at home this week.
Rowett felt his players lacked urgency at the DW Stadium, and, asked if he will be looking for an immediate response from his side as they aim to keep in the play-off race, he said: "Yeah, I think so.
"It's not necessarily me being critical of the players, it's me being disappointed.
"I can take it if we don't play with composure, I can take it if we don't play with enough quality, but what I find hard to take is when we don't show that urgency or desperation.
"If we're flooding forward and not creating much, I can accept that, but when we are just standing still waiting for something to happen, that's the frustration.
"So I will look for a reaction. We've got two home games coming up, and they are the type of games that we have performed really well in previously.
"That's the challenge in this division, you see teams up and down the league that will win a game and then will lose a game, you get that elation and then that disappointment, you have to show that reaction to bounce back.
"A win in a week, two wins in a week can change a whole outlook in this period of a season.
"We are at a point now where you can't afford to drop off for two of three games because your season is over. That's the frustration [with Saturday] because I felt it was a game that was there for us to get something out of.
"But we didn't play well enough or work hard enough to do that."
Image: Millwall FC