Minas (2018–2022) Santos made his professional debut with
Minas of the
Novo Basquete Brasil (NBB) during the
2018–19 season. He averaged 6.7 points, 5.7 rebounds, 2.5 assists, 10.5
efficiency and 23.0 minutes on the court - at only 16 years of age. In the
2018–19 NBB season, because Santos was still in school and for several other reasons, he was unable to fully follow the adult team's routine. In the 2019 Basketball Development League (LDB), he was the leader of the Minas team. At 17, his averages were 14.5 points, 6.4 rebounds and 2.6 assists in the U-20 championship. In the 2021–22 season, Santos was named the NBB Sixth Man of the Year after he averaged 10.1 points and 5.1 rebounds over the season. On 3 September 2021, he scored a career-high 34 points for Minas' U20 team in a 72–77 away win over
Flamengo U20.
Golden State / Santa Cruz Warriors (2022–present) Santos was selected by the
Golden State Warriors with the 55th overall pick in the
2022 NBA draft. He joined the Warriors for the
2022 NBA Summer League, and he later joined their
NBA G League affiliate, the
Santa Cruz Warriors. Santos was named to the G League's inaugural Next Up Game for the 2022–23 season. On 7 November 2023, Golden State signed Santos to a three-year contract. Throughout the next two seasons, Santos was
assigned several times to Santa Cruz. He made 23 appearances for the Warriors during his rookie campaign, averaging 3.6 points, 2.1 rebounds, and 0.6 assists. On 15 January 2025, Santos made his first career start, tallying five points, three assists, and seven rebounds in a 116–115 victory over the
Minnesota Timberwolves. He made 52 appearances (including two starts) for the Warriors during the
2024–25 NBA season, recording averages of 4.1 points, 3.1 rebounds, and 1.4 assists. On 29 June 2025, the Warriors exercised the team option for Santos. On 28 February 2026, Santos signed a three-year, $15 million contract extension with the Warriors. On 7 March, he recorded a career-high 22 points and 11 rebounds in a 97–104 loss to the
Oklahoma City Thunder. In a 109–106 victory over the
Brooklyn Nets on 25 March, Santos increased his career-high to 31 points, also logging three rebounds, two steals, one assist, and one block. ==National team career==