Du Preez attended the Krugersdorp-based Hoërskool Monument, where he earned an inclusion into the Golden Lions squad at the foremost schools rugby union competition in South Africa, the Under-18 Craven Week, held in Kimberley in 2011. He made three appearances as the Golden Lions side qualified to play in the unofficial final match of the competition, there they lost to the Free State Cheetahs.
In 2014, Du Preez was included in the Free State XV squad that participated in the 2014 Vodacom Cup competition. He made his first class debut in their 52–47 victory over the SWD Eagles in George in the opening match of the competition.[9] He was used as a replacement in their matches against the Boland Cavaliers[10] and Simba XV,[11] helping the Free State XV finish in second position on the Southern Section log to qualify for the play-offs. He wasn't involved in their quarter final match, where the Blue Bulls eliminated them form the competition by winning 22–21 in Bloemfontein.[12]
At the start of 2015, Du Preez moved to French Pro Rugby D2 side, where he joined the youth team (Espoirs) of Basque side Bayonne on a trial period for the remainder of the 2014–2015 season.[1] He was in the starting line-up for their matches against Agen, Brive, Clermont, Montpellier, Pau, Perpignon, Toulon and Toulouse, missing their match against Bordeaux due to concussion.
In June 2016, French Rugby Pro D2 side Mont-de-Marsan announced that Du Preez would join them for the 2016–2017 season.[19]
Notes
^ While the match scoreboard on the South African Rugby Union site lists Du Preez as an unused replacement in the match between Blue Bulls U21 and Free State U21,[13] photos taken during the match show that he did indeed appear during the match.[14][15]