Bayern Munich slumped to a 2-1 defeat at Eintracht Frankfurt on Saturday in the Bundesliga as the club world champions again showcased their vulnerabilities before their return to Champions League action next week.

Robert Lewandowski found the net 26th time in the league this season for Bayern, but Frankfurt deserved the win thanks to first-half goals by Japanese midfielder Daichi Kamada and Amin Younes.

After their 3-3 league draw at home to strugglers Arminia Bielefeld last Monday, Bayern again laboured ahead of Tuesday’s Champions League last 16, first leg tie at Lazio.

“We haven’t learned from the Bielefeld game,” Bayern captain Manuel Neuer told Sky.

“We have to be aggressive from the very beginning, we have to be wide awake. We only got going in the second half.”

Frankfurt’s win gives hope to Bayern’s league rivals as second-placed RB Leipzig can cut their lead to two points if they win at Hertha Berlin on Sunday.

It was Bayern’s third league defeat. Their last, a 3-2 reverse at Borussia Moenchengladbach in January, was followed by a shock German Cup defeat at second-tier Holstein Kiel.

In a sign of Bayern’s domestic dominance, it was only the sixth defeat head coach Hansi Flick has suffered since taking charge in November 2019.

Frankfurt capitalised on Bayern’s jaded form since they lifted the Club World Cup in Qatar just over a week ago.

Bayern were missing defender Benjamin Pavard plus forward Thomas Mueller, who were both sidelined after testing positive for Covid-19, while Corentin Tolisso is likely to be sidelined for months after injuring himself in training this week.

Frankfurt’s top scorer Andre Silva dropped out before kick-off with a back injury.

Just like in Monday’s draw against Bielefeld, Bayern were 2-0 down at half-time after Kamada opened the scoring by tucking away a cross after 12 minutes.

Kamada then set up Younes, who fired into the far corner past the diving Manuel Neuer on 31 minutes.

Bayern pulled a goal back just after the break when Lewandowski scored after Leroy Sane toyed with his marker before putting in a superb low cross.

Despite Bayern’s second-half onslaught, Frankfurt held on for a fifth straight league win which cements their hold on fourth in the table.