Liverpool manager Brendan Rodgers was delighted after his side's narrow win at Blackburn on Wednesday night.
The Reds had to work hard to battle past Gary Bowyer's side with Philippe Coutinho again the hero for Liverpool.
They will face Aston Villa away from home in the semi-final of the competition.
"I thought we played very well, both in attack and our defending was very strong," Rodgers said after the game.
"Of course you have some moments when the ball is going long into your box, but I thought we stood up to that incredibly well and our positioning and possession was good in the game on a difficult field.
"It was an outstanding team performance, the players deserve a huge amount of credit and they achieved what we wanted to - which was to get to the semi-final.
"It will be a terrific game. Obviously we have got an important game before that as well, but certainly we'll look forward to that.
"We mentioned before the game that the semi-final is played at Wembley, which is one of the great stadiums in the world. But you've got to do the dirty work and get there first, and tonight they did that very well.
"We were heavily criticised and disappointed in both of the games that we played [against Manchester United and Arsenal], because of the standard that we had set.
"So we knew this was vital for us and the supporters - they have given us great backing this evening."