Alexandre Serge Coeff (born 20 February 1992) is a French professional footballer who plays as a centre back or defensive midfielder for Championnat National club Valenciennes.

[2] A rupture of both the medial collateral ligament and anterior cruciate ligament in one of his knees delayed his professional career and, after successfully undergoing rehabilitation, he spent two years playing on the club's reserve team in the Championnat de France amateur, the fourth division of French football.

On 24 July 2024, the Indian Super League club Kerala Blasters FC announced the signing of Coeff on a one-year deal.

[14] He made his debut for the club on 23 August in a 1–0 loss against Bengaluru FC in the 2024 Durand Cup quarter final by coming as a substitute in the 63rd minute.

[15] Coeff made his first league appearance against Punjab FC on 15 September, which ended in a 1–2 defeat for the Blasters, where he played the entire 90 minutes.