The mood in training at City on Friday was described as "buoyant", in stark contrast to a day earlier, and Guardiola knows there is no time for his players to wallow with Manchester United to face at Old Trafford next Wednesday.
"Not that it is the final position we want to be, but the awareness from outside of the club, where we are, second time in a Champions League semi-final".
"To be in the position we are now is because we had the belief, the faith and trust in our quality", he said.
City are returning to domestic league action where they are two points behind leaders Liverpool, although Guardiola's men have a game in hand and can seal back-to-back titles if they win their remaining five matches.
Manchester City host Tottenham as the Light Blues look for revenge after their Champions League defeat to Spurs. "They're a strong team and it is a tough place to go but I don't think they will have played too many teams with the style we play either".More news: Joshua vs Miller: Jarrell Miller records 'adverse finding' in VADA test
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The former Southampton star recently touched on the upcoming clash with Barcelona in the Champions League, saying that he is unsure how Liverpool are going to stop Lionel Messi.
Dutch FA rules specify at least two days of rest between games and that all clubs play on the last two matchdays.
"These three games in one week against Tottenham, United and Burnley, and with the others, I don't know. We're very happy to be in the semi-final again".
Virgil van Dijk will be hoping that his experience of playing against Barcelona will be much better with Liverpool than it was with Celtic. "That makes life not easy". "We will see that". That's probably rather like we feel in the moment.
We will probably have the ball a bit more than Cardiff and that's what we have to use.
Unlike some previous visits to the stadium where Celtic even got a draw or were beaten at the death by a late goal, this was a result which was hard to watch for Celtic supporters.