Кайсери Эрджиесспор
On 30 August 2005, Korkmaz was appointed as the assistant manager at Gençlerbirliği S.K., and resigned during the same season. In January 2007, he signed in Kayseri Erciyesspor as head coach while the team were sitting at the bottom of the ladder. Under Korkmaz's management, Kayseri Erciyesspor reached the final of 2006–07 Turkish Cup, losing 0–1 to Beşiktaş J.K., however; spotting 17th position, they relegated at the end of the season.