
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."

The Werkself host Bayern Munich at the BayArena on matchday 26 in the 2025/26 Bundesliga season. The match is on Saturday, 14 March, with the kick-off at 15:30 CET. Information on ticket sales.
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Bayer 04’s four-game winning run in all competitions came to an end with a 1-1 draw away at Borussia Mönchengladbach on Bundesliga Matchday 21. Yannik Engelhardt scored early for the hosts, but an own goal from Philipp Sander brought the Werkself back level before the break.
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Werkself-TV shows the highlights of the Bayer 04 women's 0-1 loss at Eintracht Frankfurt on the 17th matchday of the Google Pixel Frauen-Bundesliga 2025/26.
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Bayer 04 have a score to settle with Borussia Mönchengladbach after their late equaliser in the reverse fixture. But it’s been a while since the points were shared in this fixture at Borussia-Park, where the Werkself have won their last six visits – their best run ever away at a team in the Bundesliga. Victory in Saturday evening’s game (18:30 CET) would also be the team’s fifth in a row in all competitions and their best run this season, while Gladbach are only just above the bottom three after going four games without a win. Here’s all you need to know ahead of the evening’s encounter in our matchday news.
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