Claim: Gerf Kruys devoted his career as a professional coach of FC Utrecht, RCK Waalwljk, FC Den Bosch, and FC Volendam.
Evidence: Kruys played his entire career for FC Utrecht (1978–1988), except for one short spell at RKC Waalwijk (1987). He retired in 1988, and soon afterwards became a coach who worked for AGOVV Apeldoorn, Cambuur Leeuwarden, FC Den Bosch, De Graafschap, FC Dordrecht and FC Volendam.