Lachuer served as Roy's assistant throughout his tenure, and according to AFP, the late coach had expressed a wish for Lachuer to succeed him as head coach. The 49-year-old former goalkeeper joined the club as a player in 2005. After retiring five years later, he transitioned into coaching goalkeepers and had been an assistant coach since 2022.
Roy, 58, had managed Brest since the start of 2023. Upon his arrival, he successfully steered the club clear of relegation from Ligue 1. In the 2023/2024 season, he led them to a sensational third-place finish, securing a historic qualification for the Champions League. Brest then advanced to the playoff round for the Round of 16, where they were eliminated by eventual champions Paris Saint-Germain.