Maradona was the captain of Argentina in 1986 and 1990, when they played Germany in the final of the World Cup. While Argentina won 3-2 in 1986, they lost 0-1 four years later.
Germany are set to play Argentina Sunday for the championship title at Rio de Janeiro's Maracana Stadium, reports Xinhua.
"Germany is not impossible (to beat)," a media source cited Maradona as saying.
Maradona, who is in Brazil as a football commentator, was the national team coach at the 2010 South Africa World Cup, when Argentina lost 0-4 to Germany in the quarter-finals.
In 2010, Maradona was the coach of the Argentina who lost to Germany 0-4
In their last match, the Germans devastated Brazil 7-1 in Tuesday's semi-final at Belo Horizonte's Mineirao Stadium.
In Argentina's last match, at Sao Paulo's Corinthians Arena Wednesday, the South American team played the Netherlands in a 0-0 draw in extra time, then defeated the Europeans in a penalty shootout that ended 4-2.