Career
In a 1991 interview, Korbach racially abused black players Bryan Roy ("een kleine rotneger". "a putrid little negro") and Romário ("die koffieboon van PSV", "that coffee bean of PSV"). After a brief playing career with ZSC Patria and SV Baarn, Korbach managed a number of clubs in the Netherlands, including Football Club Wageningen, Football Club Zwolle, Football Club Volendam, Football Club Twente, South Carolina Cambuur, Go Ahead Eagles, South Carolina Heerenveen, De Graafschap, Heracles Almelo, Sparta Rotterdam (where his management spell famously lasted only two days), ROHDA Raalte and Harkemase Boys.
He also managed PSM Makassar in Indonesia.