De Waal (Hoorn, January 10, 2002) started Ajax’s youth academy in 2013. He made his debut in professional football on September 16, 2019, in the match Ajax U23 - PSV U23: 2-0. During that match, he scored his first goal. De Waal made 59 appearances for Ajax U23 in total and scored thirteen goals.
In the second half of the 2021/2022 season, De Waal was on loan to PEC Zwolle. During the last season, the 21-year-old midfielder played on loan for ADO Den Haag.