Steve Bruce says he was disappointed with his side's reaction to going 1-0 down early in the second half as they fell to defeat at Luton.
Cameron Jerome headed the Hatters in front in the 55th minute before Allan Campbell's long-range strike secured the points for the hosts in the late stages.
And the boss insists there must be a much more positive response from the players when conceding the opening goal of a game.
Bruce said: "The response after the first goal in particular was not good enough.
“There was a lot in the first half that I was pleased about. We created enough chances, we didn’t take them – and that is a problem.
"The response to when we went a goal down was nowhere near where it should be. That will have to change, that will change. We can't accept that, and I won’t.
"There’s a lot of work to be done, that’s for sure. We have to come again on Tuesday night.
"In the first half we should've been in front with the chances we had.
“We’ve got to have a better response to what we did.
“We’ll look at it and analyse it because we have to put it right. That’s why I’ve walked through the door, to try and put it right and we’ve got to try and do that quickly.
“People have got to look at themselves and think 'am I doing enough to make sure that we’re better than what we were?'.
“Second half we were nowhere near it. You have to have the ability to roll up your sleeves a little bit and show a bit more. We didn’t have that in the second half.
“I’m hoping it's as low as what we can get. I’m hoping now that we can go to Middlesbrough, we need to go and get a result quickly and get the bandwagon rolling."
