Delcroix was born in Petite Rivière de l'Artibonite, Haiti, and at a young age moved to Kalmthout, in Belgium.
[6] On 3 August, Delcroix made his debut as a starter in the away match against VVV-Venlo, scoring the opener in the eleventh minute of play.
After made a total of 24 competitive appearances, all as a starter, his loan spell ended and Delcroix returned to Anderlecht.
On 22 August 2023, Delcroix joined Premier League club Burnley on a three-year contract for an undisclosed fee.
[9] On 24 January 2025, Delcroix joined fellow Championship club Swansea City on loan for the remainder of the season.