Career
He can play as a lock, a flanker or a number eight. Youth
Du Preez was selected in a number of KwaZulu-Natal youth squads whilst still at school. At primary school level, he was selected for their squad that played at the 2008 Under-13 Craven Week competition.
He also played in the premier schools competition in South Africa – the Under-18 Craven Week in three different seasons.
He made two appearances at the 2011 event in Kimberley, three appearances at the 2012 event in Portuguese Elizabeth – scoring a try in their match against the Free State – and a further three appearances in 2013, scoring a try against Border. In both 2012 and 2013, Du Preez was selected to represent a South African Schools team
In 2012, he played in their matches against France and Wales and in 2013 he made appearances against England and Wales. He recovered from an injury that kept him out of the 2014 Institutional Review Board Junior World Championship to play a key part in the Sharks U19 side that played in the 2014 Under-19 Provincial Championship, making eleven appearances and scoring tries in their matches against Eastern Province U19 and Free State U19 to help them qualify for the semi-finals, where they lost 20–43 to the Blue Bulls U19.
Sharks
In 2015, despite not having featured at senior provincial level for the Natal Sharks, Du Preez was included on the bench for the Sharks" Round Five Super Rugby match against the Cheetahs.
He made his Super Rugby debut in the Sharks" 27–10 victory, coming on for the final ten minutes of the match. South Africa Under-20
In 2014, he was selected in the South Africa Under-20 squad to play at the 2014 Institutional Review Board Junior World Championship, but an injury ruled him out of the competition and was replaced by Jacques Vermeulen. In March 2015, Du Preez was named in an extended South Africa Under-20 training group as part of their preparation for the 2015 World Rugby Under 20 Championship.
He featured for them in a friendly match against a Varsity Cup Dream Team in April 2015.
In May 2015, he was included in the South America Under-20 squad that toured Argentina. He started both of their tour matches, scoring a try in the 25–22 victory in the first encounter and was then included in the final squad for the 2015 World Rugby Under 20 Championship.
Du Preez"s father Robert is a former Springbok scrum-half that made seven appearances for South Africa between 1992 and 1993. He has an older brother – also called Robert – and a twin brother Jean-Luc.
Both of them also represented the South America Under-20 side at the Institutional Review Board Junior World Championship, in 2013 and 2014 respectively.