Bayern Munich will play the Club World Cup final in Qatar without experienced central defender Jerome Boateng.
The 2014 World Cup winner will return home for personal reasons, following reports from Germany of the death of his former partner.
"This has stunned us," coach Hansi Flick told a press conference on Wednesday.
"Jerome came to me and asked me to return home.
"He will return home and not be available until further notice."
Bayern will face Mexican club Tigres UANL in the Club World Cup Final on Thursday.
Boateng had started in their 2-0 semi-final victory over Al Ahly on Monday.
The German champions are eyeing a sixth title in less than nine months, hoping to emulate Barcelona's six-trophy haul of 2009.
Bayern have won the domestic double as well as the Champions League in 2020 along with the German and European Super Cup crowns. They are also currently top of the Bundesliga, seven points ahead of second-placed RB Leipzig.
Tigres stunned Palmeiras of Brazil 1-0 to become the first team from North America to reach the final.
Flick, who refused to provide any details on his possible lineup, said his team would need to be alert from the first second against the quick counter-attacking Mexicans.