Graham Alexander was disappointed with his side's performance as they were defeated 2-0 at Swindon Town.
The City boss admitted the Bantams were "deservedly beaten" having started too slow in the game and again allowing their opponents to take an early advantage.
“It was a difficult afternoon, but we made it difficult (for ourselves),” he said.
“I do not think we played with anywhere near enough intensity as we needed too.
“It was not good enough. We were deservedly beaten. We gave them space, we gave them time on the ball and we had doubt in our mind.
“It is a lesson for us today, that if we want to continue to play on the front foot and be aggressive, then we have to commit to it.
“There were too many times where our players did not do that today.”
Alexander wants to see improvements from his side quickly after seeing standards slip since a positive run over the festive period.
He is not afraid to look at himself and his methods, as he looks to put right the sub-par form in recent weeks.
“We have to keep working,” he added.
“We have to show the players what it looks like when it is working for us, and when it is not, and give them that contrast.
“I still believe there are opportunities there for us, but we obviously have to improve, especially from the first half.
“I will look at myself first, and then look at the team. We will look for the players' feedback on Monday as well.
“We want it to be a conviction that we will do more together as a team.”