Grace and former world No. 1 McIlroy, who has not contested Africa's Major' since 2009, when he withdraw from the tournament with a stomach virus after 36 holes, will have the in-form Haotong Li as the third member of the three-ball.
Li is playing at the Gary Player Country Club having finished second in the Turkish Open at the weekend, when he lost in a playoff to new world No. 1 Justin Rose.
Full Starting Times: Nedbank Golf Challenge hosted by Gary Player