Defeat to Slovakia was Germany's third in four friendly outings ahead of Saturday's final pre-Euro 2016 match versus Hungary.
Germany's stuttering friendly form has not shifted their focus away from Euro 2016 glory ahead of their final warm-up match against Hungary.
Joachim Low handed international debuts to Joshua Kimmich, Bernd Leno, Julian Brandt and Julian Weigl in a rain-lashed Augsburg on Sunday, but, despite experienced striker Mario Gomez opening the scoring with a penalty, Slovakia came from behind to record a 3-1 victory.
It was Germany's third defeat in four friendly outings since the conclusion of Euro 2016 qualifying, following defeats to France and England for the world champions before a resounding 4-1 win over Italy.