Julien De Sart

Standard Liège

On 22 August 2013, De Sart made his debut in the UEFA Europa League against Belarusian FC Minsk in a 2–0 away win. He played the full game. He's a youth exponent from the club. He is the son of Jean-François De Sart who has been a board member of Standard Liège, and the elder brother of Alexis De Sart who previously played for Standard Liège. He made his league debut at 25 August 2013 against R.A.E.C. Mons in a 2–0 away win, coming off the bench in the first half for an injured Yoni Buyens. After 83 minutes he was sent off with a second yellow card. At 24 November 2013, he scored the only goal against R.A.E.C. Mons.

Middlesbrough

On 1 February 2016, it was confirmed that De Sart had joined English club Middlesbrough of the Championship side on a three-and-a-half-year contract for an undisclosed fee. On 5 January 2017, it was confirmed that De Sart would be moving to Derby County on loan for the remainder of the season. He scored his first goal for Derby in a 4–3 loss to Cardiff City on 14 February 2017. On 27 June 2017, De Sart was sent on loan to Belgian Pro League team Zulte Waregem for the 2017–18 season, thus making a return to Belgium after leaving Standard Liège in January 2016.

Kortrijk

In August 2018, De Sart left Middlesbrough and joined Kortrijk.

Gent

On 15 June 2021, he moved to Gent on a three-year contract.

Al-Rayyan

On 30 July 2024, Gent announced De Sart's transfer to Al-Rayyan in Qatar.

As of match played 13 September 2024

Gent

Belgian Cup: 2021–22