The Bayern Munich sporting director criticised the late goals conceded in the 9-2 demolition of Hamburg, insisting it cannot be repeated on Tuesday
Die Roten cruised to a staggering 9-2 victory in the Bundesliga on Saturday, with Claudio Pizarro scoring four for the Bavarians, although they did allow the visitors to strike twice in the final 15 minutes.
Despite the astounding scoreline, Sammer was quick to stress the importance of avoiding such a late show in the Champions League quarter-final first leg.
"This should not happen to us if possible," the 45-year-old told Bild when asked about conceding the two goals.
"We have to get a clean sheet against Juve. In recent weeks we have shown we are human. I can understand that. But now we want to be machines."
Arjen Robben echoed Sammer's thoughts about banishing any complacency ahead of the clash in Munich on Tuesday, despite the result against a "helpless" Hamburg leaving them on the brink of regaining the domestic title.
"Of course, a result like that makes an impression - you don't often see nine goals scored in Europe," the 29-year-old said.
"But the result will not make us complacent. It was a dress rehearsal for the Champions League to a point but really it was more like a warm-up for the Juventus match. The opposition were helpless."