
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.”

The Bayer 04 Women clcoked up a 3-2 win in a friendly against Twente Enschede on Thursday afternoon in the last international break of 2025. In drizzle, Lilla Turanyi (16’), Kristin Kögel (65’) and Paulina Bartz (69’) scored the goals for the Werkself against the Dutch Eredivisie Vrouwen leaders, who are still unbeaten in the league.
Show more
Werkself TV shows highlights of the 2-0 win for Bayer 04 at Manchester City on matchday 5 in the UEFA Champions League 2025/26 league phase...
Show more
The annual Black and Red Week is up and running. And day two, Wednesday 26 November, includes a coupon flyer with big discounts...
Show more
Bayer 04 won 2-0 at Manchester City on Matchday 5 of the league phase in the 2025/26 UEFA Champions League! Alejandro Grimaldo scored before half-time and Patrik Schick added another after the break for a Werkself side that had been hit by numerous personnel losses before their trip to England.
Show more