Bayern Munich forward Thomas Mueller shows his frustration during Sunday s shock home defeat to Frankfurt Christof. AFP
"We are of course disappointed. Or angry, annoyed, I don't know which best describes it," said Mueller in the wake of Sunday's 2-1 shock home defeat to Eintracht Frankfurt.
"This is a game that we definitely didn't have to lose."
Bayern and their new head coach Julian Nagelsmann suffered his first defeat in any competition this season as Filip Kostic hit a low shot past Manuel Neuer from a tight angle seven minutes form time.
It was Bayern's first home league defeat since November 2019 and Frankfurt's first win in Munich for 20 years.
"Defeat always hurts," Nagelsmann admitted. "On one hand, because it was the first, and on the other, because it was totally avoidable."
Bayern had 20 shots on goal to the visitor's five and had 73 percent possession, but paid the price for not making their domination count.
"When we go 2-1 up, it can also end up being a 3-1 or 4-1 result, then we hear 'Super Bayern' being sung, but that (performance) had nothing to do with 'Super Bayern'," admitted Mueller.
"It's an unfamiliar situation, an unfamiliar feeling."
Despite the home defeat, Bayern stay top of the Bundesliga, but level with Bayer Leverkusen, who also have 16 points. The clubs meet in a fortnight.
Frankfurt's Kevin Trapp, Germany's fourth-choice goalkeeper, pulled off a string of world-class saves.
After seeing Leon Goretzka's first-half shot fly past him for Bayern's opening goal, Trapp did superbly to block a Robert Lewandowski header early in the second half.
"That was pure intuition, you don't have much time to think about it," said Trapp after the reflex save with his foot.
He then denied Serge Gnabry, Leroy Sane and Lewandowski again before celebrating wildly with his team-mates after the final whistle at the Allianz Arena.
"I don't think many believed that we had a chance here," added Trapp after Frankfurt's first win this season under new coach Oliver Glasner.
"It was really a lot of work, but we defended very well against a Bayern team that is in incredible shape."
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