He played college basketball in the United States for the Saint Mary's Gaels before debuting in the NBL in 2017 with the Sydney Kings.
[2] He helped the Gaels reach the second round of the NCAA Tournament as a reliable sixth-man, averaging 6.6 points and 6.1 rebounds per game while shooting an efficient 61% from the field.
[5][6] Pineau finished as Saint Mary's all-time leader in field goal percentage, connecting on nearly 62% of his attempts.
[5] In April 2017, Pineau signed with the Sydney Kings of the National Basketball League (NBL).
[7] In April 2019, Pineau signed with the South East Melbourne Phoenix for their inaugural season in the NBL in 2019–20.
He made his return from a meniscus tear for the Breakers' final game of the season on 5 February 2025 against the Illawarra Hawks.
[5] Pineau played for the Australia men's national under-19 basketball team at the 2013 FIBA Under-19 World Championship in Prague.