The Reds slumped to a desperately disappointing 3-1 away defeat to struggling Bolton Wanderers last Saturday.
However, Dalglish's post match rant at his players was all the more surprising considering how the Scotsman has always tried to shield his players from criticism.
Their limp display at the Reebok Stadium though saw Dalglish lambast his charges, even threatening to axe some of them after revealing that their attitude prior towards their clash was unsatisfactory.
The former Kop forward has now warned his troops to shape up ahead of their Carling Cup semi-final encounter with City and their FA Cup fourth round tie with United this week.
"I was annoyed and disappointed, more so about the attitude, the commitment and the approach to the game - that wasn't us," Dalglish was quoted as saying in an article from The Sun.
"All season we've been very complimentary about the way the boys have gone about their work but I don't think you could say that on Saturday. Their approach to the game was poor."
"Whether they had their minds on the next two games, I don't know. But every game we play is a very important game."
"If they want to get any success at this football club, they have to understand we respect every opponent we come up against. We were never going to be able to just turn up and get a result."
"If you have pride in yourself and in the football club that reflects in the effort you put in. I don't know where that attitude came from but it needs to go quickly."
"Saying how well Bolton played is the easy option for us. We made it difficult for ourselves. Collectively, we just never played."
"It was certainly an unacceptable performance. Now we will get our minds on the Man City game."
"We have to solve our own problems. What do we do to put it right? Same as we always do - we work."
The Kop outfit will face the Citizens on Wednesday before their massive FA Cup fixture with United at Anfield on Saturday.