Centre Fédéral (2020–2021) In the 2020–21 season, Dieng averaged 12.6 points, 5.8 rebounds, and 2.9 assists per game for
Centre Fédéral in the
Nationale Masculine 1.
New Zealand Breakers (2021–2022) On 1 June 2021, Dieng announced that he would play for the
New Zealand Breakers of the
National Basketball League (NBL) in the
2021–22 season, alongside fellow Frenchman and eventual
2022 NBA draft selection
Hugo Besson. He became the first European player to join the league's Next Stars program to develop
NBA draft prospects. Dieng had also been recruited by major
college basketball programs and the
NBA G League Ignite. Dieng left the Breakers on 17 April 2022 in order to prepare for the
2022 NBA draft.
Oklahoma City Thunder / Blue (2022–2026) Dieng was selected with the eleventh overall pick by the
New York Knicks in the
2022 NBA draft, and was then immediately traded to the
Oklahoma City Thunder in exchange for three
2023 first-round draft picks. On 15 April 2024, he won the
NBA G League title with the
Oklahoma City Blue and was named the
championship game most valuable player after getting 25 points, six boards, four assists and two blocks in the win against the
Maine Celtics. Throughout his first three seasons, Dieng has been
assigned several times to the
Oklahoma City Blue. In the
2024–25 NBA season, Dieng appeared in 37 games, as Oklahoma City clinched its first-ever NBA championship with a victory over the
Indiana Pacers. Dieng played in 27 games for Oklahoma City during the
2025–26 season, averaging 3.7 points, 1.6 rebounds, and 1.0 assist.
Milwaukee Bucks (2026–present) On 4 February 2026, Dieng was traded with a 2029 second round pick to the
Charlotte Hornets in exchange for
Mason Plumlee. Later in the day, Dieng,
Collin Sexton, and three second-round draft picks were traded to the
Chicago Bulls in exchange for
Coby White and
Mike Conley Jr. On 6 February, Dieng was traded again to the
Milwaukee Bucks in a trade that also involved the
Phoenix Suns. In his Bucks debut on 11 February, he scored 17 points and made a career-high five three-pointers made during a 116–108 win over the
Orlando Magic. On 1 April, Dieng put up a career-high 36 points, along with 10 assists, in a 119-113 loss to the
Houston Rockets. ==National team career==