Early career Born in
Rouen, Situ began his career playing for Football Club Saint-Étienne du Rouvray in the
department of
Seine-Maritime, spending his childhood years with the club's under-11 squad. In 2003, he moved up north to the
next region over joining
RC Lens on a youth contract. While at the Gaillette, short for the
Centre Technique et Sportif de la Gaillette, Lens's youth academy, Situ established himself as one of the club's top youth prospects, alongside fellow defender
William Rémy and
midfielders Alexandre Coeff and
Mehdi Abeid. He captained Lens's under-16 team that reached the semi-final stage of the
Championnat National under-16 league, though Lens finished the group stage without a single point. While playing with the national under-16 team, Situ, alongside
Rennes starlet
Jérémy Hélan, drew the interest of
Premier League clubs
Manchester United,
Chelsea, and
Liverpool, as well as
Portsmouth. Situ, at one point, met with Manchester United
manager Alex Ferguson, but a deal could not be reached. France teammate Helan later joined
Manchester City.
Lens Despite constant rumours of Situ rejecting a contract with his parent club for a move abroad, on 4 February 2009, he signed his first professional contract agreeing to a three-year deal with Lens. For the
2009–10 season, despite being only 17, he was inserted onto the club's senior team, but was not assigned a number. Manager
Jean-Guy Wallemme, instead, allowed the young player to get some stable playing time in the
Championnat de France amateur, the fourth division of
French football, with the team's reserve squad. Situ made his debut in the reserves opening match against
Vesoul Haute-Saône, appearing as a substitute. He earned his first start the following week playing the entire 90 minutes in the team's 0–0 draw with
Olympique Noisy-le-Sec. After appearing on the bench for several league and cup matches with the senior team at the start of the 2010 portion of the season, Situ made his professional debut in the club's Round of 64
Coupe de France match against amateur club
AFC Compiègne. He started the match in the
centre back position alongside veteran
Ala Eddine Yahia and played the entire 90 minutes in the team's 1–0 victory. Situ had a trial at
Newcastle United and scored a goal in his debut in a reserves match 5–0 win over Gateshead Reserves.
Swansea City Situ agreed a two-year deal with Swansea on 31 August 2011 signing for an initial fee of £250,000. Several weeks later, FIFA announced that international clearance would not be granted for Situ. As a result, Lens loaned him out to Swansea for the 2011 portion of the season and, on 10 January 2012, announced that it had reached an agreement with Swansea on a permanent deal. On 25 September 2012, Situ was an unused substitute in Swansea's 3–2 win over
Crawley Town in the
League Cup. On 13 November 2012, Situ ruptured his Achilles in a 2–1 defeat to
Cardiff City Under-21s. After nearly a year out, Situ returned to the
Swansea City Under-21s squad on 4 November 2013. Darnell left the Swans at the end of the 2014 season without making a senior appearance.{{cite news|url=https://www.bbc.co.uk/sport/football/27384850|title= Four players leave Swansea City
AGF Aarhus On 18 August 2014, Situ signed a one-year deal with
AGF on a free transfer. ==International career==