The Germans enter the match as the strong favourites having secured a 4-0 win in the first leg last week, but Guardiola believes that there will be fireworks this evening.
"Two fantastic teams are playing, everything could happen. They are two teams who have had an extraordinary domination of their leagues, what they have achieved this season is well deserved," he told AS.
"I am very impatient [to see the game], but I am very bad at making predictions."
Guardiola, who left Barcelona last summer, will take charge at Bayern at the end of the season.