Bayern Munich winger Jamal Musiala suffered a fractured fibula and dislocated ankle during Saturday's Club World Cup encounter against Paris St Germain.
The 22-year-old former Chelsea youngster was stretchered off following a clash with PSG keeper Gianluigi Donnarumma at the Mercedes-Benz Stadium in Atlanta.
Strikes from Desire Doue and substitute Ousmane Dembele condemned the Bundesliga champions to a 2-0 defeat against the French side, who finished with nine men after late dismissals for Willian Pacho and Lucas Hernandez.
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A Bayern statement issued on Sunday confirmed: "Jamal Musiala suffered a serious injury during the Club World Cup quarter-final between Bayern and Paris St Germain in the USA and had to be substituted at half-time.
"Examinations by the German champions' doctors have revealed that the attacking midfielder sustained a fracture of the fibula associated with a broken and dislocated ankle.
"The 22-year-old flew from Orlando to Munich on Sunday morning and will undergo surgery soon."
Bayern manager Vincent Kompany revealed in his post-match press conference that his blood was "still boiling" following the incident involving a player of Musiala's calibre.
He commented: "It was tough. I've rarely been so angry at half-time – not against my players. There's many things in life that are important, much more important than this, but in the end for these guys it's their life.
"Someone like Jamal lives for this, he came back from a setback (injury) and then it happens in the way it happens and you feel powerless.
"The team was fighting and I think the second half, we were just starting to edge the game, and it looked like it could happen any time for us.
"You try to get strength out of it because you want to do it for Jamal but when I'm sat here next to you now, the thing that gets my blood still boiling at the moment is not the result, I understand this is football.
"It's the fact that it happened to someone that, one, enjoys the game so much but is also very important for us."
Bayern keeper Manuel Neuer branded his opposite number's challenge as "reckless" whilst Donnarumma showed his support for Musiala via an Instagram post following the fixture, writing: "All my prayers and well wishes are with you Jamal Musiala."
Musiala left Chelsea to join Bayern in 2020 aged 16. Chelsea take on Brazilian side Fluminense in the semi-final of the Club World Cup on Tuesday.
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