Pep Guardiola hit out at referee Antonio Mateu Lahoz after being sent to the stands at half-time, though he conceded Liverpool deserved to reach the Champions League semifinals over his Manchester City side.
Perhaps the last person Liverpool fans wanted to start against Manchester City was Dejan Lovren.
"I have absolutely no interest in comparing us".
"It was quite hard tonight, especially with the start", said Liverpool manager Juergen Klopp.
"In the same time we pretty much didn't win anything as a club".
Liverpool fans' celebrations were already in full swing by the time Firmino pounced on an error by Otamendi to score the victor on the night.
"We only can develop".
"It's all good but it's not that you can enjoy it completely, but I don't care who is in [the competition]. We have given ourselves a great opportunity".
Fired-up by that breakthrough and with the crowd roaring them on, City was first to every ball, applying constant pressure on the Liverpool defense while Juergen Klopp's side was unable to earn some respite.
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Mo Salah, Alex Oxlade-Chamberlain and Sadio Mane all scored in the first 31 minutes of the match for Liverpool, who also made sure City didn't get that all-important road goal.
Roberto Firmino's cool finish 13 minutes from the end wrapped things up.
"I know that Mo feels really good here, and he knows that our style of play is flawless for him", he said.
"I was polite, I was correct, but Mateu Lahoz is a special guy, he likes to be different, he likes to be special".
"At halftime, we said if we scored a goal it would change the atmosphere", Klopp said.
Loris Karius had surprisingly little to do despite City's dominance, but he escaped repercussions for a poor punch when Sane was flagged offside after finishing from close range, even though the ball had bounced into his path off James Milner.
AS Roma caused a considerable upset on Tuesday night when they sealed a 3-0 win over FC Barcelona in the Italian capital to seal a 4-4 draw on aggregate and progress through to the last four on away goals.
Youth team players Conor Masterson (19), Curtis Jones and Rafael Camacho (both 17) have been training with the first team and were unused substitutes for last weekend's Merseyside derby as Jurgen Klopp looked to manage his injury-depleted squad in between the European quarter-final against Manchester City.
"When the teams are so equal, the impact of these decisions is so big".