
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."

Following their 4–3 opening victory against Denmark, the Germany U19s made it two wins out of two by defeating hosts Wales, securing their place in the semi-finals with a game to spare. In the 4–0 win, Bayer 04 players Montrell Culbreath and Francis Onyeka once again put in impressive performances, with both finding the back of the net.
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Bayer 04 Leverkusen have signed home-grown talent Sana Coskun on professional terms. The 18-year-old midfielder, who made her Bundesliga debut last season, has signed a contract to 30 June 2029.
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Attacking midfielder Paulina Bartz is leaving Bayer 04 Leverkusen for good on a permanent move to Hamburger SV in the Google Pixel Women’s Bundesliga. The 21-year-old, who was on loan to the newly promoted side in the winter, originally had a contract to 2027.
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The Bayer 04 Football School opened in 2007 – now this successful programme is getting a new name and a new logo: with immediate effect, the Bayer 04 Football School powered by BarmeniaGothaer is becoming the Bayer 04 Football Academy powered by BarmeniaGothaer.
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