A central defender, Jeanvier began his career in 2000 with hometown club US Clichy-sur-Seine. He moved to L'Entente SSG in 2006 and trained concurrently at Clairefontaine, before joining the academy at Nancy in 2008. Jeanvier progressed into the reserve team and made 54 appearances and scored two goals in the Championnat de France Amateur between 2009 and 2013. The appointment of former head of youth Patrick Gabriel as first team manager midway through the 2012–13 Ligue 1 season saw Jeanvier promoted into the first team squad and he made 10 appearances between January and April 2013. He refused the offer of a new two-year contract extension and departed the Stade Marcel Picot at the end of the 2012–13 season.
In August 2016, Jeanvier dropped into Ligue 2 to join Reims. He established himself in the starting lineup and was voted into the UNFP Ligue 2 Team of the Year at the end of the 2016–17 and 2017–18 seasons. Jeanvier had a successful 2017–18 season, vice-captaining the team and helping the club to the Ligue 2 championship and promotion to Ligue 1. He departed the Stade Auguste-Delaune in July 2018, after making 67 appearances and scoring five goals for the club.
Brentford
On 30 July 2018, Jeanvier moved to England to join Championship club Brentford on a four-year contract, with the option of a further year, for an undisclosed fee, speculated to be £1.8 million. He scored a goal in each of his first two appearances for the club, which came in the early rounds of the EFL Cup, but a foot injury suffered in October 2018 ruled him out for two months. The unavailability of Chris Mepham and new head coach Thomas Frank's deployment of three centre backs saw Jeanvier win a starting place on his return to fitness in December 2018 and he remained a near-ever present starter until the end of the 2018–19 season.
International career
Jeanvier was a member of the France U18 team which finished runners-up at the 2010 Copa del Atlántico, but he failed to win a cap. He made his debut for Guinea in a 1–0 friendly defeat to Gambia on 7 June 2019 and made one appearance at the 2019 Africa Cup of Nations.
Personal life
Jeanvier was born in France and is of Guinean and Guadeloupean descent. His father was also a footballer and played for Red Star. He is married to a Guinean woman and has a Guinean passport.
