Dieng began his career with Diambars in the Senegal Premier League, and had 12 goals in his first 14 games in his debut season.

[4] He made his debut the club in a 2–0 Coupe de France win over Auxerre on 10 February 2021, scoring a goal in the 92nd minute of the game.

[6] Dieng debuted with the Senegal national team in a 4–1 2022 FIFA World Cup qualification win over Namibia on 9 October 2021.

[7] He was called up to the Senegal squad for the 2021 Africa Cup of Nations in January 2022, scoring his first goal for the side in a 2–0 round of 16 victory over Cape Verde.

[8] In the 2021 Africa Cup of Nations Final, Dieng scored in the penalty shootout to help Senegal become the champions of the tournament.