
The 18-year-old has worn the Black and Red shirt since 2013 and he has made 16 appearances for the Bayer 04 U19s in the current U19 Bundesliga West campaign. He has also been very much in demand with the Germany youth teams. Boller (pictured above in the middle with Lucas Alario and Sam Schreck in the game at Heidenheim) has earned 15 caps for the Germany U17 team and he was a first choice in central defence at the 2017 European Championships in Croatia as well as the World Cup in the same year in India. He played alongside Kai Havertz in the Bayer 04 U17s in 2016 when they won the Germany U17 championships with a 2-0 victory over Borussia Dortmund in the final.

Werkself-TV shows the highlights of the Bayer 04 women's 1-2 loss against VfL Wolfsburg on the 2nd matchday of the Google Pixel Women's Bundesliga 2026/27.
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Bayer 04’s eight opponents in the group stage of the 2026/27 UEFA Europa League have been confirmed. At the draw on Friday 28 August held at the Grimaldi Forum in Monaco, the Werkself were drawn against two opponents from each of the four pots. There are a total of four home and four away matches. Read on for details of opponents and fixture dates.
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In the 3-2 defeat at Bundesliga newcomers SV 07 Elversberg, the Werkself found the back of the net in the closing stages and, with a bit of luck, could still have equalised. “Today, our play wasn’t good enough, particularly when it came to the basics,” said head coach Carles Martínez. Like the boss, Ibrahim Maza also wants to learn from the match and look ahead: “Next week, people should be able to see from the very first minute that we want it more than our opponents.” The Werkself review on the Bundesliga opener in 2026/27.
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Werkself TV shows the highlights of Bayer 04's 2-3 loss at SV 07 Elversberg on Matchday 1 of the 2026/27 Bundesliga season...
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No points to start the league campaign: Bayer 04 lost 3-2 away to newly promoted SV 07 Elversberg in the first Bundesliga match of the 2026/27 campaign. Two quick-fire goals from Lukas Petkov (8’) and Cole Campbell (10’) gave the hosts an early lead, before David Mokwa scored the Saarland side’s third shortly after half-time (46’). In the closing stages, the Werkself rallied and staged a late comeback with goals from Patrik Schick (77’) and Christian Kofane (90+1’), but the Black and Reds were denied an equaliser.
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