Seydou Sy (French pronunciation: [sɛdu si]; born 12 December 1995) is a Senegalese association footballer who plays as a goalkeeper for BGL Ligue club Mondercange.

He made his first team debut on 20 May 2017 in the final Ligue 1 match of Monaco's championship season against Rennes, a 3–2 away win; he started the match and kept a clean sheet before being replaced by fellow debutant Loïc Badiashile at halftime.

[3] On 11 February 2021, Sy signed a short-term contract with Portuguese Primeira Liga strugglers Nacional.

[4] On 24 May, after not appearing officially for the club, it was announced that his contract had been terminated, following the Madeira side's relegation to the second tier.

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