The Manchester City forward admits that he was overjoyed to edge past the Netherlands in a penalty shootout on Wednesday night, and he is certain that Joachim Low's side will be expecting their toughest test in the Maracana this weekend.
"The truth is incredible. I am so happy, we cannot believe it," Aguero told reporters after returning from injury as a substitute in their semi-final triumph in Sao Paulo.
"Germany are always a tough team at the World Cup but we will continue to play our game. Argentina is Argentina. Germany also have a bit of respect for us."
The game on Sunday will be a repeat of the 1986 and 1990 finals.