The Spanish coach masterminded a great win for City in the round of 16 first leg away from home in Madrid.
They came from 1-0 down to achieve the result, making it even more impressive.
But when asked about his tactical adjustments for the game, Guardiola told reporters jokingly: "It doesn't count because we won, it doesn't work that way.
"The important thing is the way we played.
"We tried to come here to win the game and we did. This is just the first part. If one team can overcome this situation, it's this club.
"When we were better, we conceded a goal. When they were better, we scored a goal. That's football.
"I remember the quarter-final a few seasons ago at Anfield when we played incredibly well and they scored all their shots on target."