"If you do it, it's a success and if we don't do it, we will be disappointed, but we would not stop working and would not stop believing in this project".
A strike from Aguero midway through the second half cancelled out James Milner's 49th-minute penalty and a point apiece was fair after an absorbing, exhilarating game.
De Bruyne, who had been moved to the right flank in a tactical switch by Pep Guardiola, then hit a post and Aguero missed a good chance, but so did Lallana for the visitors.
After the game, Guardiola gave an oddly positive interview, describing Sunday as "one of the happiest days of my life as a manager".
"After the game Adam immediately said to me sorry, and I thought 'why?'" said Klopp, as quoted by the Liverpool Echo.
Guardiola hailed the performance and character of John Stones for overcoming criticism, but he was left to rue a familiar failing after City failed to capitalise on the "clear chances" they created.
The win would have put Liverpool ahead of City, even if they'd have a game in-hand but the draw now means that the upcoming Merseyside Derby now holds even more weight than usual. It set the tone for Manchester City who bombarded Liverpool's box with low crosses, all throughout the evening.
City are 12 points behind leaders Chelsea and two behind second-placed Tottenham Hotspur while Liverpool are a further point back.
When Liverpool took the lead through James Milner's penalty in the 51st minute, City's resolve was tested again.
A rain-slicked pitch and two attack-minded teams made for a furious first half at the Etihad Stadium, characterised by City possession and Liverpool counter-attacks. "The spirit, how we played, it is one of my happiest days as a manager". "No idea! I'm more interested in what mood we are in".
"The easy angle is to say there'll be goals because of both teams' defensive frailties, but it's time now for both of them to learn".
"He helped us a lot this game, he played a good game, intercepted a lot of balls, so there is no point in blaming him".
But was the result satisfactory for either side and where does it leave them in the race for Champions League qualification?
According to Robson, City have long felt as though they could recoup in excess of £85 million for the striker if they were to sell, although now he'd reportedly be allowed to depart for nearer £50 million. "If he can't (score), then I thought because he had worked so hard before".
"With all his huge amount of mistakes, I love him".
Liverpool supporters will argue that, on the balance of their play, they deserve to be higher up the table.