Liverpool have scored 75 goals this season, second only to Man City.
If City somehow manage to overturn their first-leg loss they will match their best-ever finish in the Champions League.
"My running numbers are pretty consistent throughout the year, we get them regularly but I think it was slightly higher the other night (against City)", he said.
Jurgen Klopp's side have registered back-to-back clean sheets, following up their European win with a goalless draw in the Merseyside derby at Everton, and that has given them more confidence ahead of their trip to Manchester.
Guardiola's side gave up a two goal lead in that game and they know that even a single slip-up against Liverpool will make their task of progressing to the semi-finals nearly impossible. "We shouldn't change from the first game".More news: Hungary's future at stake in general elections: Orban
"You could see in the second half (of the first leg) we were tucked in and it was hard to defend and they came through more than they did in the first half so I don't think we should sit too far back. But when you play against Liverpool or in Europe when you have that momentum you have to close the door".
The Brazilian made the claim in City's press conference on Monday, with compatriot Danilo having accused Manchester United of the same at the weekend.
"But we must be together".
"We played the same way we done all the season, we kept the same level of performance, but today it didn't work".
"If we were not able psychologically it would be a good lesson for the future, because we are not just here for a few months", he said. "We know that and the opponents know that".
"Our focus is on the second leg against Liverpool and the only way to play good football is to be positive". We can make it hard for any team in the world but we have to show it.