Sanasi Mahamadou Sy (born 4 April 1999) is a French professional footballer who plays as a left-back for Bulgarian First League club Krumovgrad.
On 6 September 2018, Sy signed his first professional contract with Amiens SC. He made his professional debut for Amiens in a 1âÂÂ0 Coupe de France win over Valenciennes FC on 5 January 2019. In January 2019, he was loaned to Tubize until the end of the season.
On 19 January 2021, Sy signed with Serie B club Salernitana until 2024.
On 20 August 2021, he went to Cosenza on loan.
On 31 January 2023, Sy returned to France and joined Nîmes.
In January 2025, he moved to Bulgarian First League club Krumovgrad.
Sy was born in Paris to a Senegalese father and Malian mother. He has French nationality.