Admiraal played in the youth of ASWH. He made his debut in the first squad on 18 January 2020 against SV Spakenburg in the Tweede Divisie, still 17 years old. In 2021, Admiraal turned down a move to ADO Den Haag for fear of his growth being stunted without regular first-team football. He was subsequently awarded the ‘Gouden Bal’ (Golden Ball) award for the best player in the Tweede Divisie in 2021, despite ASWH battling relegation. He was ASWH's top scorer at this time.
