[4] In 2019, Sarr joined the Spanish club Real Madrid Baloncesto and played two seasons for their youth team.

[5][6] In 2021, Sarr moved to the United States to join the newly established Overtime Elite league in Atlanta, securing him an alternative professional pathway with a guaranteed minimum salary of at least $100,000 per year.

[16] He finished the season with averages of 9.4 points, 4.3 rebounds, 1.5 blocks and 0.9 assists in 17 minutes per game,[17][18][19] helping Perth reach the NBL play-off semifinals.

[25] In 2021, Sarr debuted for the French junior national team[26] and helped them win the FIBA U16 European Challengers.

[30] His father Massar is a former professional basketball player from Senegal, while his older brother Olivier played for the NBA's Oklahoma City Thunder.