Born in Woluwe-Saint-Lambert,[2] he is part of the Borlée family which is prominent in Belgian athletics and includes his older sister Olivia (b.

[3] He made his international debut at the 2011 European Athletics Junior Championships, competing in the 4×400 metres relay team, which finished sixth.

[13] And later that same year, he was on the Belgian 4 x 400 metres men's relay team that won the gold medal at the European Athletics Championships.

[14] Having qualified for the men's 400 metres relay at the 2024 Summer Olympic Games via the World Athletics Rankings,[15] he finished 7th in the heats[16] and was eliminated in the repechages.

[18] The progenitor of the Borlee family is Jacques, bronze medalist at the 1983 European Indoor Championships in Budapest on 200 m, while his first wife Edith Demaertelaere was a good sprinter with a personal best of 23.89.

The four sons are all 400 m specialists, the twins Jonathan and Kevin, both Olympic finalists in London 2012, Dylan and the youngest Rayane.