Kaj Sierhuis

Ajax

Sierhuis was born in Athens, Greece, on 27 April 1998, when his father, Cock Sierhuis, was president of AEK Athens. The family returned to the Netherlands when Kaj was four years old, and he grew up in Jisp, North Holland. He had started playing football with WSV '30 in Wormer in the province of North Holland as a five-year-old before moving the to Ajax Youth Academy at age 11. In August 2016, he signed his first professional contract and made his first appearances for Jong Ajax on 25 November 2016 in an Eerste Divisie match against Telstar. That season he also continued to play for the under-19 team in the league and in the UEFA Youth League. In the 2016–17 season, he was top goalscorer in the UEFA Youth League alongside Jordi Mboula of Barcelona. In the 2017–18 season, Sierhuis, who had outgrown the youth teams, was not always part of the regular lineup, but scored 14 goals in 20 appearances and became second-tier Eerste Divisie champion with Ajax's second team, which could however not win promotion due to Dutch league rules. Sierhuis made his first competitive appearance for the Ajax first team on 25 July 2018 in a 2–0 win in the UEFA Champions League second qualifying round against Sturm Graz. After making just two appearances in the Eredivisie, Sierhuis agreed to a loan move to Groningen until the end of the season with an option to buy. He quickly earned a starting place as Groningen qualified for play-offs for a place in the UEFA Europa League third…

As of match played 12 September 2026

Jong Ajax

Eerste Divisie: 2017–18