The 28-year-old midfielder announced the agreement before Sunday’s league clash with Paris Saint-Germain.
Advertisement
Advertisement
Magnetti began his career in the youth systems of Olympique de Marseille, Burel and SC Bastia before joining Brest in 2017, initially playing for the reserve side.
He became a regular first-team player a year later and has since made more than 200 appearances, scoring six goals and providing seven assists.
The midfielder is now Brest’s vice-captain and played a key role during their Champions League campaign two seasons ago.
Magnetti started 31 of his 33 Ligue 1 matches last season, scoring once and assisting twice, and has started two of three games this term.