Bayern Munich captain Philipp Lahm says the champions' 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 their league title defence.
"Our game wasn't bad, just okay," he said. "Unfortunately we conceded the early goal and then we missed that final pass. Otherwise we would have been able to create a lot of chances.
"I said many times in recent years, but nobody wanted to believe me: it's not this easy to be on the top of the table all the time and to confirm these achievements. It's a difficult task - now we'll see just how difficult."
Asked if they could seal a shock title win, he said: "I don't know, I'm not clairvoyant. For now, they are doing really well. They won in Leverkusen, which is never easy. We have to wait and see how long momentum is on their side."
Goalkeeper Manuel Neuer feels Bayern have been made to pay for dropped points against Cologne, Eintracht Frankfurt and Hoffenheim as much as against Dortmund.
"Before the game, I didn't look at the table, but now we should do that," he said. "It's extremely annoying - not only because of this game but because of the draws. We gave away the points."
