De Nysschen, 25, originates from Pretoria, South Africa where he attended Afrikaanse Hoër Seunskool (Affies), a very prestigious rugby school. In 2014, he played for the Blue Bulls Rugby Academy U18s and later joined the U19 National Currie Cup Championship side advancing to the semi-finals.

He continued his education and rugby career at the University of the Free State in Bloemfontein, South Africa playing on the U19 Free State Cheetahs then promoted to the U21 team.

In 2017, de Nysschen moved to the US and joined the Glendale Rugby Academy playing for the Glendale Merlins D1 team. During the Fall of 2018, he played for the Glendale Raptors for the Exhibition season and soon signed with the Raptors for their Inaugural Season. During the 2019 season, de Nysschen scored two tries and kicked 5 conversions, and was named twice in the ‘MLR Team of the Week’. He became an American Qualified player and re-signed with the Raptors for the 2020 season.

De Nysschen spent the 2021 season with San Diego where he played 12 games, 8 of which were starts, and scored 2 tries and kicked a total of 15 points.