
Between 2014 and 2016 Maas, who played for Arminia Bielefeld and Hertha Berlin in the Bundesliga plus MSV Duisburg in the second division, was assistant coach to the current Bayer 04 head coach Peter Bosz. They were in charge at Dutch club Vitesse Arnhem for a total of 62 games in the Eredivisie. “In Rob Maas, we’ve appointed an innovative and strong-minded assistant coach who fits in really well here. He knows the Bundesliga and has already worked successfully with Peter Bosz. Rob will provide new ideas,” declared sporting director Simon Rolfes.
For Rob Maas, Bayer 04 are “a highly ambitious and very attractive club. That’s not just the perception in Germany but Leverkusen also have an outstanding reputation across Europe,” said Maas. “To be able to work with fellow coaches in developing an extremely exciting team is a fantastic challenge I’m really looking forward to.”

A special visit to the BayArena: 222 members from volunteer fire brigades in Leverkusen, the Rheinisch-Bergisch district and the Oberbergisch district watched the Werkself’s 2–0 home win over Slovenian champions NK Celje live in the stadium. Bayer 04 had invited them to the 2026/27 Europa League opener as a thank-you for their tremendous dedication. They watched the match together in Block F4.
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The Bayer 04 U19s have extended their winning run with a fifth consecutive victory on Matchday 5 of the DFB Youth League’s preliminary round. Coach Patrick Greveraars’ side secured a 3–2 (2–1) win in their match against second-placed FC Viktoria Köln, with Burak Kir and Nebe Domnic scoring for the hosts in the first half before captain Ben Hawighorst found the net after the break.
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Bayer 04 will have to manage without defender Guéla Doué for the time being. The Ivory Coast international sustained a muscle injury to his right calf during the final Werkself training session yesterday ahead of the Europa League clash with Slovenian champions NK Celje.
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For the first time since reaching the final against AS Roma (2–2, first leg 2–0) in May 2024, Bayer 04 are playing another home match in the UEFA Europa League – and they will be wearing their new European kit. On Wednesday 16 September (kick-off: 21:00 CEST), the BayArena will welcome Slovenian champions NK Celje, who appointed a new coach this week following a mixed start to the season. Under the slogan “40 Years Across Europe. Still Creating History.”, the Black and Reds now aim to add the next chapter to their European history, which has seen so much success in recent years. Bayer 04 fans can follow the match on free-to-air TV on RTL, as well as on Sky and Werkself Radio. The matchday news.
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European football returns to the BayArena: Bayer 04 host Slovenian champions NK Celje on matchday 1 in the group stage of the 2026/27 UEFA Europa League. Ahead of the match on Wednesday 16 September (kick-off: 21:00 CEST), head coach Carles Martínez and midfielder Aleix Garcia spoke at the pre-match press conference. The focus was primarily on the great anticipation surrounding the competition and the clear objectives for it – and, given the circumstances, on a last-minute change to the opposition line-up.
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