Olivier first represented Bloemfontein-based side Free State at high school level, playing as a lock for them at the Under-18 Craven Week competition held in Welkom. Olivier played for UFS Shimlas during the 2014 Varsity Cup. After the Varsity Cup, he also became involved with the Free State XV in the 2014 Vodacom Cup competition. He made his first-class debut by playing off the bench.
After the 2015 Varsity Cup, Shimlas head coach Franco Smith was appointed as the head coach of Super Rugby side the Cheetahs and he included four Shimlas players in his first match in charge against the Waratahs, with Olivier named as a replacement forward for the match.
PRO14 debut – 1 September 2017 vs Ulster in Northern Ireland
After a long-term injury, Olivier got back on the field in the SuperSport Rugby Challenge, he played his first match on 28 April 2018 against the Griffons.
Olivier has establish himself as the first choice flanker during the 2018/19 Pro14 season. For a change Olivier has not been plagued by injuries, and he is among the leading defenders in the competition.