"The team will play very differently at the European championship," Beckenbauer said two days after the team he once graced suffered their worst away defeat in 65 years in a friendly in Bucharest on Wednesday.
"There will be a challenge, there will be points to fight for and we will be well prepared," the president of the organising committee of the 2006 World Cup in Germany told reporters in Nuremberg.
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Beckenbauer also mentioned Germany's traumatic defeat in a column in Friday's Bild daily.
"Perhaps it was a wake-up call," he wrote. "Our defeat and the Netherlands' 4-0 victory over Greece will count for nothing when serious business starts."
Germany, who have often recovered from similar misfortunes, will play the Netherlands, the Czech Republic and Latvia in a tough group D in the finals in Portugal starting on June 12.