"I am sure of it," the former Germany goalkeeper told fifa.com. "We've got the best team at this World Cup: we're organised, compact and fantastic on the ball.
"You can tell that a lot of our boys, including some of the ones on the bench, are used to playing in the latter stages of the Champions League.
"Germany have got greater strength in depth and we've got more players who play at the highest level every year."
The meeting is the third time the two nations have met in the final in the tournament.