Why is Germany's Antonio Rudiger wearing a face mask at Euro 2020?

If you've been paying close attention to Germany at Euro 2020, you'll have noticed that their defender Antonio Rudiger is wearing a mask while he plays.
If you've been paying close attention to Germany at Euro 2020, you'll have noticed that their defender Antonio Rudiger is wearing a mask while he plays.

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Why is Germany's Antonio Rudiger wearing a face mask at Euro 2020?

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Toni KROOS (GER) and Leon GORETZKA (GER) were in the stadium, wearing face masks and masks. Soccer Laenderspiel, friendly game, Germany (GER) - Daenemark (DEN) 1-1 on 02.06.2021 in Innsbruck/Tivoli Stadium Stock Photo - Alamy

Why is Germany's Antonio Rudiger wearing a face mask at Euro 2020?

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