Assistant coach Michael Skibbe has no doubts that Germany will make safe progress to the second stage of the World Cup.
The Germans must get at least a draw out of their final Group E match against Cameroon to be sure of reaching the last 16.
"One of the two teams will qualify and I'm convinced it will
be us," Skibbe said.
"I'm sure we will be in the second round and after that the chances will be 50-50, whoever we meet," he said.
"That goes for the round of 16, the quarter-finals and the semi-finals."
The tournament's top scorer, Miroslav Klose, missed training on Friday for the second day in a row but is still expected to be fit for Tuesday's crucial game.
"He's still got problems with his knee and he should be able to resume proper training on Saturday or Sunday at the latest," said Skibbe.
There was also good news about defender Christoph Metzelder, who also missed training after injuring his right ankle in Wednesday's draw with the Republic of Ireland, but is expected to play against Cameroon.
Germany goalkeeper and captain Oliver Kahn echoed the assistant coach's upbeat mood in the wake of the frustration of conceding a last-minute equaliser against Ireland.
"We were all able to get over the disappointment and pick ourselves up," Kahn said.
"Optimism has returned and we are confident that we will beat
Cameroon."
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