Bayern Munich captain Philipp Lahm says the champion's 1-0 defeat to Borussia Dortmund proves the Bundesliga is tougher than some observers think.
A goal early in the first half from Pierre-Emerick Aubameyang sealed the win for Thomas Tuchel's side and brought an end to Bayern's unbeaten start to its league title defense.
The result leaves the Bavarians with 24 points from their first 11 matches, marking their worst start to a season since they posted just 16 points in the same period under Louis van Gaal in 2010-11.
And Lahm says the team's defeat underlines the fact that the German top flight is far tougher than Bayern made it appear to be during its dominance under Jupp Heynckes and Pep Guardiola in the last four seasons.