[1] De Geus started playing hockey at Almere where he went through all the youth ranks until he made his debut for the first team.

[4] In November 2016, de Geus was selected for the 2016 Junior World Cup, where the team finished seventh.

[5] He made his debut for the senior national team at the age of 18 in a test match against South Africa in 2017.

[6] He was part of the Dutch team that won the silver medal at the 2018 World Cup.

[9] In December 2019, he was nominated for the FIH Rising Star of the Year Award.