The South Americans booked a clash against Germany at the Maracana on Sunday by beating the Netherlands in a penalty shootout.
The country has not reached the final in the past 24 years, but Sabella is confident that if his team are at their best, they will be bringing the trophy home.
"There is such joy, such great happiness," Sabella told reporters. "It was a difficult game, very tight, but World Cup matches are like that.
"Now we are in the final, we are aware of our qualities and certain that we can win the World Cup. We'll give our all. We need humility, hard work and to give 100%."
The last time that Argentina reached the World Cup final in 1990 they were beaten by the Germans.