[7] He spent a large part of his playing career in France with his hometown club Marseille, whom he represented in two different spells.

From 2004 to 2009, he worked as Alain Perrin's assistant coach at Al Ain, Portsmouth, Sochaux, Lyon and Saint-Étienne (ASSE).

[8] In December 2009, Galtier was appointed the head coach of Saint-Étienne, with ASSE in danger of relegation following the departure of Alain Perrin.

[10] His European debut as a head coach is a 3–0 home win over Moldovan club Milsami Orhei in the 2013–14 UEFA Europa League qualifying phase on 1 August 2013.

[16] Galtier was praised by many pundits over the course of the season for both his tactics and his ability to develop young talent including Jonathan David, Renato Sanches, and Mike Maignan.

[24] On 5 July 2022, Galtier agreed a two-year deal to become the manager of Ligue 1 champions Paris Saint-Germain, replacing Mauricio Pochettino.

[25] In his first transfer window, he oversaw the arrivals of Hugo Ekitike, Nordi Mukiele, Fabián Ruiz, Renato Sanches, Carlos Soler, and Vitinha.

[33] On 30 June 2023, together with his son John Valovic-Galtier, Galtier was taken into custody by the French police as part of the investigation into suspicions of racial and religious discrimination, at the time of his experience at Nice.