
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.”

Full-back Julia Mickenhagen is leaving Bayer 04 Leverkusen at the end of the season to join Bundesliga newcomers VfB Stuttgart. The 21-year-old’s contract with the club expires on 30 June.
Show more
Werkself-TV shows the highlights of the Bayer 04 women's 3-1 win at RB Leipzig on the 25th matchday of the Google Pixel Frauen-Bundesliga 2025/26.
Show more
The Werkself need a win in their penultimate match of the season at RB Leipzig on Monday evening (18:00 CEST) to keep their hopes of third place alive until the final day. After Eintracht Frankfurt lost on Saturday, Roberto Pätzold's side can close the gap on their rivals to two points and leave it all to play for next Sunday.
Show more
Werkself fans from across the New York City area gathered Saturday morning at Smithfield Hall in Manhattan to cheer on Bayer 04 in the club’s crucial Bundesliga showdown against VfB Stuttgart given the match’s big implications.
Show more
In the next head-to-head clash for the Champions League places at VfB Stuttgart, Bayer 04 failed to follow up their impressive 4-1 win at home to RB Leipzig from the week before. After Aleix Garcia gave the Werkself the lead with their fastest goal of the season, the Swabians turned the game around and won 3-1, knocking Leverkusen down into sixth place. It leaves them needing a win at home to Hamburger SV and other results to go their way on the final day of the 2025/26 campaign in order to reclaim fourth spot. The Werkself Review has all the analysis and reaction from all those involved in an eventful encounter with VfB.
Show more