Following an historic 7-1 demolition of Brazil in the semi-finals, the now-retired goalkeeper is confident that Joachim Low's men will prove too strong for the Albiceleste.
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"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.
"You only need to look at the kind of big international games the Bayern [Munich] players have been involved in over the last few years. That makes a huge difference because you gain a lot of experience from those sorts of encounters."
Lehmann had particular praise for Manuel Neuer, his successor between the sticks for the national side.
"He's had a perfect World Cup so far," the former Arsenal man enthused. "He's without doubt the best goalkeeper there is at the moment.
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Lehmann also had words of praise for an Argentine, namely Lionel Messi, but does not expect the Barcelona No.10 to find enough room to work his magic.
"[Messi]'s more than capable of deciding matches on his own but on Sunday I don't think he'll have it any easier than he did in the semi-final against the Netherlands," he argued. "If anything it'll be harder for him.
"Messi is outstanding but Germany have got a more complete attack and they'll break down the Argentine defence, although they might have to be patient."