The South Americans have the chance to win the trophy for the third time tonight (Sunday) when they face Germany in Rio de Janeiro.
While Germany have been tipped as the favourites to clinch the title this evening, Sabella has warned them that the Argentines are focused on triumphing.
"The mood is positive and they're brimming with confidence. They have a winning mentality, but they know they're up against top-class opponents. We need to produce a perfect performance to beat them," he told FIFA.com.
Sabella, who took charge of Argentina in 2011, has remained silent in recent weeks over his future in the role.