Florentin began his youth career playing for several clubs in Île-de-France. He came to the attention of Spanish side Celta Vigo and was signed by them in 2007. After spending two seasons there, he signed for Sedan in 2009. He made his first appearance with the first team at the Coupe de France on 20 November 2010. Team earned 2-0 victory against the amateur club FC Steinseltz. He made his league debut on 5 February 2011 in a 0–1 defeat to Boulogne.
While he has never played a professional match, he was called up by the coach Michel Dussuyer in the selection for Guinea for a friendly against Mali on 11 August 2010. He made his international debut in the second half and his team defeated Mali 2-0.