
He will undergo further treatment at Bayer 04. A replacement has yet to be called up.
Germany U21 coach Stefan Kuntz said: "It's a purely precautionary measure. In discussion with Jona, our doctors and Bayer Leverkusen we have reached the decision to send the player home for treatment. Of course, it's a pity one of our leading players misses out on the start of the European Championship qualifiers but we do have options in central defence in our squad."

As well as previously confirmed departures, Bayer 04 Women will also say goodbye to Vanessa Haim and Shen Menglu before Sunday’s final game of the season at home to Werder Bremen as the pair leave Leverkusen upon the expiration of their contracts.
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Goalkeeper Anne Moll will leave Bayer 04 Leverkusen at the end of the season. The 21-year-old will join second-tier club VfL Bochum 1848 when her contract expires on 30 June.
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This Sunday will see the end of a special era at Bayer 04 Women: Kristin Kögel will play for the Werkself for the last time in the final match of the season at home to SV Werder Bremen. After six years in Leverkusen, the 26-year-old midfielder will take on a new challenge abroad from the summer.
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Ahead of the conclusion to the 2025/26 season with the Werkself and the World Cup with Argentina, Bayer 04 midfielder Exequiel Palacios answered questions from journalists from the Latin America region. In a digital media round, the 27-year-old, who's been in Leverkusen since 2020, spoke about the "great development potential" in the current Werkself squad as well as his World Cup ambitions with the Albiceleste, among other things.
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