Born in Lyon, Sambia joined the youth set-up at Niort from Mâcon in 2013.

[5] In the summer of 2014, he was awarded a first-team contract alongside fellow youth midfielder Antoine Batisse.

[5] Sambia made his senior debut for Niort on 12 September 2014 in the 1–0 defeat to Dijon at the age of 18 years and 5 days, becoming the youngest player ever to start a professional match for the club.

[2] In August 2017, Sambia joined Montpellier on a one-year loan with an option to buy.

[citation needed] In April 2020, Sambia was hospitalised after becoming ill and unconscious and was treated in intensive care.