Manchester City have a 3-0 lead over Bayern Munich ahead of this week’s second leg in Germany.
Despite the comfortable lead, Guardiola has warned his Manchester City stars that the tie is not yet over.
Guardiola said: “Absolutely, we know that [it’s never over until it’s over].
“We have to try our game and think we will win the game. We have to defend otherwise they have the rhythm. It’s a real tough opponent. We go there to achieve something unique, to reach a semi-final.
“We have to play with the right mentality and be stable in the bad moments and go for it.”