Club career
Brest
Born in Pabu, Côtes-d'Armor, Le Normand represented Brest as a youth player. On 21 September 2013 he made his senior debut, starting with the reserve team in a 1–0 CFA 2 away loss against Lannion.
Le Normand scored his first senior goal on 19 March 2016, netting his team's third in a 3–3 draw at Fougères. On 15 April, he made his professional debut by starting in a 2–1 away loss against Sochaux for the Ligue 2. He was released at the end of the season.
Real Sociedad
On 5 July 2016, Le Normand signed a two-year deal with Real Sociedad, being assigned to the B-team in Segunda División B. He received a new contract in August 2018, for two more years.
Le Normand made his first team – and La Liga – debut on 26 November 2018, starting in a 2–1 home win against Celta Vigo. The following 12 February, he renewed his contract with the Txuri-urdin until 2022, and was definitely promoted to the main squad on 9 June.
After the departure of Héctor Moreno, Le Normand became an integral part of the starting XI. He scored his first La Liga goal on 30 November 2019, opening the scoring in a 4–1 home win against Eibar. He was rewarded with a contract extension until 2024 on 4 June 2020. On 19 December, he scored in an 8–0 win at Tercera División club Becerril in the first round of the Copa del Rey; he also played in the 1–0 win over Basque derby rivals Athletic Bilbao in the COVID-delayed final on 3 April 2021.
Le Normand was chosen as La Liga Player of the Month for October 2021, the first defender since Diego Godín of Atlético Madrid in 2014. He played 48 out of 51 games in 2021–22, missing only one league game by suspension, and then extended his contract until 2026.
Atlético Madrid
On 27 July 2024, Atlético Madrid announced an agreement with Real Sociedad for the signing of Le Normand. A week later, he signed a five-year contract. On 19 August, he made his debut for the club in a 2–2 draw against Villarreal in the league, and 18 May 2025, he scored his first goal for the club in a 4–1 win over Real Betis.
On 27 September 2025, Le Normand scored a header in a 5–2 win over rivals Real Madrid, their biggest derby win since November 1950. Three days later, he scored his first-ever UEFA Champions League goal in a 5–1 win against Eintracht Frankfurt.
La Liga
Champions League