Carlo Ancelotti said FC Bayern München's inability to control the game in "crucial moments" cost them as they were held to a 1-1 draw with FC Schalke 04 on Saturday.
Robert Lewandowski had opened the scoring for the Bundesliga leaders on nine minutes but were pegged back by a 13th minute Naldo equaliser.
Bayern still ended the weekend four points clear of second-placed RB Leipzig as a result of just their third loss of the season, 1-0 to third-placed Borussia Dortmund.
After the game, Ancelotti told the club's official website: "It was a tough match for us, Schalke played well. We started well but weren't compact enough later.
"Our rearguard and midfield line weren't close enough to each other. We failed to win possession in the crucial moments, that's why we had problems. Overall it wasn't enough, we'll focus on the next match now."
Goalkeeper Manuel Neuer, meanwhile, felt Bayern were unlucky not to have built on their first-half goal, while Schalke coach Markus Weinzierl bemoaned a number of missed chances for his side to have claimed all three points from the Allianz Arena tie.
Neuer said: "Of course it's always about the result, but also about the way we played. Things didn't go as planned in the first half, that's clear.
"We tried everything in the second half and were somewhat unlucky in terms of our chances in the closing stages. We can't always be lucky as we were recently against Freiburg."
Weinzierl added: "We turned in a decent display especially in the first half. We stomached the early goal well. We didn't take two gilt-edged chances later, we should have gone up then.
"We failed to do it, so we were under pressure in the second half. It's also clear that you need luck against Bayern's individual class. We had that luck."
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