Phil Brown says he will be going “as strong as he can” against local rivals Colchester United in the Checkatrade Trophy.
The U’s are Blues’ final Southern Group B game in the competition before the knockout stages.
Brown says Saturday’s defeat to Yeovil Town can serve as a warning to approach the game with the right mentality.
And the Blues boss is expected to field a strong line-up against John McGreal’s Colchester.
“Tomorrow night we’ve got to be collectively above par and make sure that we do come out of the game having won the game and gone through to the next round,” he said.
“Because of Saturday’s result, it has affected team selection like any game would do. I always think about making changes unless it’s a run of ten games undefeated, and then you have one out of the blue, but this one isn’t out of the blue.
“This one was against lesser, supposedly, opposition by definition being a second division team. Again we’ve got that tomorrow night, so we have to make sure we’re on our mettle, that we’re organised and that we’re prepared to do the hard miles.
“If we do all that tomorrow night then hopefully the quality will come out.”
Michael Turner could get some game time in his return to full fitness, after the centre back was included in Saturday’s matchday squad.
And Brown is expecting a big performance in the Essex derby.
“Cup competitions at this level are vitally important to finances, but not just finances, the most important and interesting part of tomorrow night is bragging rights.
“It’s a derby match and you always want to beat your local rivals.
“I know John’s [McGreal] a feisty character and he’ll be coming with a game plan to upset the odds and win the game.
“Consequently, because of the defeat on Saturday, we’ll be going as strong as we can.”