Ajax Dekker came through the youth system at
Ajax, where he played in every single youth category from the age of 6. He made his debut at Jong Ajax on 12 August 2016 in an
Eerste Divisie game against
Almere City. He played the entire match in a 4–1 away win.
AZ Alkmaar Dekker joined
AZ Alkmaar on 8 May 2018 on a free transfer from
AFC Ajax. After playing 18 matches for
Jong AZ in the first half of the season, his contract was dissolved.
Go Ahead Eagles On 10 January 2019, it was announced that Dekker had signed with
Go Ahead Eagles until the end of the season with the option for another season.
SV Spakenburg On 26 October 2019, Dekker joined
Tweede Divisie club
SV Spakenburg. ==References==