Goals in each half from Marcel Sabitzer and Christoph Baumgartner, along with Sane's red after making contact with the face of Austrian defender Phillipp Mwene, compounded a poor night for Julian Nagelsmann's men in the friendly.
The red card, Sane's first in a professional football career spanning more than 400 games, meant Germany were forced to play catch-up for most of the second-half with a man down. "I think the red card for Leroy just sums it all up: the frustration, the disappointment," Germany captain Ilkay Gundogan told TV network ZDF.
"At the end we made it far, far too easy for the Austrians to create and score goals. We were simply not good enough." Sane later apologised to fans and his teammates on social media, saying "despite my emotion and ambition, this can't happen to me, especially in our current situation".
Nagelsmann said his side could turn things around "only with extremely hard work". Austria forward Michael Gregoritsch described the victory as "extremely nice, extremely sweet... it was a nice conclusion to the season".
The visitors have now won just three of 11 matches in 2023, a run which claimed the scalp of former coach Hansi Flick, the first manager sacked in Germany history. Austria have now won seven and lost just one of their ten matches in 2023 while qualifying for Euro 2024, continuing an impressive run under former Manchester United coach Ralf Rangnick.
Rangnick praised his troops, saying "I told them before the game to be courageous, play with pleasure and enjoy the game - and they did all three."
With eight of Austria's starting XI playing in the German Bundesliga, the home side refused to be awed by their decorated neighbours, cutting gaping holes in the visitors' backline from the
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