
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.”

It was a perfect start for Bayer 04: in Carles Martínez's first competitive match as Leverkusen head coach, Patrik Schick broke SV Wehen Wiesbaden's resistance shortly before half-time. The Black-and-Reds pulled clear in the second half, winning by a final score of 4-0. There was also good news on the personnel front. The Werkself Review of the 2026/27 DFB Pokal first-round clash.
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After the 4-0 win at SV Wehen Wiesbaden in the first round of the DFB Pokal, goalscorers Lucas Vázquez and Nathan Tella spoke to Werkself-TV...
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Werkself-TV shows the highlights of Bayer 04's 4-0 win at Wehen Wiesbaden in the first round of the DFB-Pokal 2026/27...
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Bayer 04 have comfortably reached the DFB Pokal second round thanks to a 4–0 victory away to Liga 3 side SV Wehen Wiesbaden. Patrik Schick put the Werkself ahead in the first 45 in the first competitive match under head coach Carles Martínez with debuts for new signings Miguel Gutiérrez, Afonso Moreira and Facundo Medina. After the break, Lucas Vázquez (47'), Nathan Tella (69') and Christian Kofane (79') also found the back of the net.
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