Blues boss Paul Sturrock was angry after his side slipped to a 2-0 defeat away at Barnet.
Strurrock felt it was the first time in a long time that he could point fingers at players for failing to approach the game with the right attitude.
He now insists Saturday’s game against Rotherham has become even more important in Blues’ push for promotion to League 1.
Speaking after the game, Sturrock said: “That’s really the first time in a long time that I have been able to point my finger at players for not performing.
“We disrespectfully approached the game thinking all we needed to do was turn up and that was certainly not the case.
“We just never seemed to get going and after playing so well on Saturday that’s the biggest disappointment for me.
“There are no games in this division that you can approach expecting to win; you have to earn it and tonight we didn’t.
“Barnet deserved to win, it’s as simple as that. It’s a tough defeat to take because we know we can do much, much better than that.
“The importance of a win against Rotherham has increased because of tonight, it’s a very big game for us now.”
Sturrock was also disappointment in the manner that Blues went behind as Jake Hyde headed home Mark Byrne’s free kick.
He added: “We had probably been on top up to that point but we hadn’t managed to get a goal and it was a very disappointing one to concede.
“Then the second goal came as we were pushing up the pitch looking for a goal to get us back into the game.
“A few things will need looking at ahead of Saturday because it’s a very big game for us against a good side.
“Hopefully the lads will respond in the right manner and I know they’ll be desperate to put in a good performance in front of the home fans.”