Matthaus was scathing in his post-match assessment, labelling the display as “appalling” and suggesting that Germany were fortunate the scoreline was only 2-0.
"You can always lose 2-0, the question is just how. Much more surprising than the defeat itself was the manner," he said. "The way we played football was appalling. And if we're honest, the result was very flattering. It easily could have been 4-0 or 5-0."
Germany had never before lost a World Cup qualifier away from home, making this defeat all the more seismic.
"When you lose 2-0 and the goalkeeper of the losing team was the best player, you know what that means," Matthaus added. "We have the quality in our ranks. But I had the impression that Julian Nagelsmann's team was quite surprised. They weren't expecting this style of play. They were caught off guard by the Slovaks' aggressive pressing. They played one-on-one all over the pitch, and we couldn't cope with that at all. We never found and showed the right attitude in this game. And that's one thing I don't like at all."