
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.”

Bayer 04’s Ibrahim Maza is among the three nominees for the Bundesliga’s 2025/26 Rookie of the Season award. Fans have until 23:59 CEST on Thursday, 7 May to cast their votes in the official Bundesliga app.
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Werkself-TV shows the highlights of the Bayer 04 women's 4-0 win at SGS Essen on the 24th matchday of the Google Pixel Frauen-Bundesliga 2025/26.
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The Bayer 04 Women have kept their chance of qualifying for the Champions League alive in the Bundesliga run-in. Coach Roberto Pätzold's team won 4-0 at SGS Essen on Sunday afternoon, improving their record from last season to 14 wins this term. With 43 points, the Werkself equalled another record from the 2024/25 season and at the same time reduced the gap to third-placed Eintracht Frankfurt to two points, at least for tonight. Loreen Bender (4’), Kristin Kögel (41’, 68’) and Cornelia Kramer (89’) scored for the Black and Reds, who dominated the game to record their fourth win on the bounce.
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With the 4-1 home win against RB Leipzig, the Werkself not only ended the run of five consecutive victories for RBL, but also moved up to fourth place, which would ensure qualification for the UEFA Champions League. While the media praised the impressive performance of Leverkusen's hat-trick hero Patrik Schick in particular, the team and coach were delighted with the "fantastic energy" from the stands and are looking to take the momentum into the remaining two games: "We have to perform like we did today in Stuttgart!" The Werkself review.
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