[5][6] Basketball website Eurobasket.com also named Van Slooten as Most Improved Player and Newcomer of the Year in the Regionalliga North, a part of the fourth-tier German league.

He left Vechta on August 3, 2020, to move to fellow Bundesliga side Basketball Löwen Braunschweig.

[14] Van Slooten debuted for Germany at the 2016 FIBA Europe Under-16 Championship, averaging 5.8 points, 1.2 rebounds, and 0.4 assists.

[16] At the 2017 FIBA Europe Under-16 Championship, when he was 15 years old, he assumed a leading role for the German team, averaging 10.4 points, 4.4 rebounds, 2.6 assists, and 2.6 steals.

[9][16] Van Slooten also appeared at the 2018 FIBA Europe Under-16 Championship, where he averaged 10.6 points, 5.9 rebounds, 2 assists, and 2.6 steals per game.