Adrianus Cornelis "Adrie" Koster (; born 18 November 1954) is a Dutch football manager who was most recently the manager of Willem II. He is a former winger and former manager of Ajax, Club Brugge and the Netherlands U21 team. Career He played for Roda JC (1977–79) and PSV Eindhoven (1979–83). He played his last match in the Eredivisie on 2 October 1982, replacing Jurrie Koolhof. In the following season 1983/1984 he retired from professional football as a player. International Koster obtained three caps (no goals) for the Netherlands national football team in 1978. Managerial career Three years after the end of his playing career, Koster began his managerial career. His first job was the second-tier Eerste Divisie club FC Eindhoven, where he worked as an assistant coach for a year. He then went to the Eredivisie club Willem II, where he worked alongside Piet de Visser. After the club had found itself in a relegation battle under his leadership for two seasons, Koster took over the reigns as head coach. This did not bring a change, which meant that he was dismissed after barely a year in charge, and he was again replaced by De Visser in 1991. In 1991, Koster took over as head coach for Roda JC, where he had been active as a player. Two years later, Huub Stevens took over as head coach and Koster returned to the Eerste Divisie to coach first Helmond Sport and since TOP Oss, before moving to Excelsior in 1997. Koster had his longest employment there and in 2002, he won promotion to the Eredivisie with the club. He could, however, not avoid relegation the following season, and Koster was dismissed after six years in charge. In the following season, he led VVV-Venlo to the Eerste Divisie promotion play-offs, but did not manage to achieve promotion with the club. His next coaching job was RKC Waalwijk, where Koster was dismissed after a year due to poor results in 2006. He became head of the youth academy of Ajax, and was appointed manager of the club's main squad on 9 October 2007, when Henk ten Cate went to Chelsea. On 8 April 2009, Koster replaced Jacky Mathijssen as Club Brugge manager, with him signing a contract until the end of the season with an option for an extra season. On 25 February 2010, Koster's contract with Club Brugge was extended until