Mees Siers guided De Graafschap O21 to a KNVB Cup final victory over Willem II O21 on April 26, 2026, securing the team’s first major trophy through collective effort and humble leadership. The 38-year-old former De Graafschap defender, now serving as youth coach, emphasized teamwork in his post-match remarks, stating “We doen het samen bij De Graafschap” – a sentiment that encapsulated the victory.
The match, played on Saturday April 25, 2026, ended with a 2-1 win for De Graafschap O21 against their age-group rivals from Willem II. Siers, who celebrated his 38th birthday on October 6, 2025, has been instrumental in developing young talent at the Gelderland-based club, with several players from the O21 squad having already made appearances for the first team this season.
According to De Gelderlander, Siers’ approach reflects the club’s philosophy of developing homegrown talent through collective effort rather than individual stardom. The victory represents a significant milestone in Siers’ coaching career, which began after his retirement from professional football following the 2018-19 season with De Treffers.
Siers’ playing career spanned over a decade, including stints with De Graafschap (2006-2010), AGOVV Apeldoorn (2010-2012), Helmond Sport (2012-2014), SønderjyskE (2014-2015), ÍBV (2015-2017), Fjölnir (2017), and De Treffers (2018-2019). His transition to coaching began with an internship at NEC’s youth setup before returning to De Graafschap as a youth trainer in 2019.
The O21 team’s success highlights the effectiveness of De Graafschap’s youth development system, which has seen multiple players progress to the first team during the 2025-26 season. Siers’ leadership style, characterized by humility and a focus on collective responsibility, has become a defining feature of his coaching philosophy.
Looking ahead, Siers and the De Graafschap O21 squad aim to build on this cup success as they continue their league campaign. The victory serves as both a reward for the players’ hard work and validation of the club’s long-term investment in youth development through experienced guidance.
For continued updates on De Graafschap’s youth teams and Siers’ coaching journey, fans can follow the club’s official channels and local Gelderland sports coverage.
