Born in Veldhoven on 7 August 2004, Aertssen swapped Sparta's youth academy for Ajax's in 2019. On 11 January this year, Aertssen made his first-team debut during the KNVB Cup match FC Den Bosch - Ajax (0-2). So far, this was the youth international's only game in the main squad.
In addition, Aertssen played a total of 27 times for Ajax U23, the selection to which the right winger belongs.
The Aertssen family loves to spend time on the water: 'Even on the water, we talk about football'
It is the ideal place to relax or have some quality time with family: in a boat on the water. With Olivier and his father Gaico we choose the open water in their new hometown of Almere. The eighteen-year-old Ajax defender joined the club's youth academy in 2019 and made his debut in the first team in the cup match with FC Den Bosch. "On the water, the conversations are always about football."