In 2015 Rougier-Lagane went to France for the third consecutive year as a junior to race as part of a development squad.

[3] At the national hill climb championships Rougier-Lagane won the overall posting a quicker time than everyone in every category.

[4] While riding the Tour Antenne Réunion, in 2022, he fell sick and went from first overall to seven minutes down in stage three.

[6] His first UCI podium other than the national championships came in 2023 where he placed third overall in La Tropicale Amissa Bongo.

[7] In 2024, he finished third overall and won the final stage of the Tour d'Algérie.