 In March 2006, Greeff underwent neck surgery that involved the fusion of two vertebrae.After spending six months in rehabilitation, he returned to play one game for Stellenbosch University second XV (the Victorians) against the University of Cape Town in September 2006 and scored a try within the first 20 seconds.He made his return to first-class rugby as a starter in Western Province's home game against Griquas in the 2006 Currie Cup, and started again a week later, when WP lost in the semi-final to the Blue Bulls.