Poole was selected by the Warriors with the 28th overall pick in the 2019 NBA Draft. He made his NBA debut during the first game of the season, Oct. 24 against the Clippers. In 21 minutes, Poole accumulated five points (2-13 FG, 1-7 3Pt), two rebounds, two assists and one steal. Overall, in 57 appearances, Poole averaged 8.8 points, 2.4 assists and 2.1 rebounds in 22.4 minutes per game. He shot 33.3 percent from the field, 27.9 percent from three on 4.6 attempts and 79.8 percent from the free-throw line. His best stretch of the season was 10 games from Feb. 5 through Mar. 3. He scored in double-digits in every contest, averaging 15.8 points on 12.1 shots, 4.4 assists and 2.9 rebounds in 29.1 minutes. Arguably his best all-around performance of the season was his last game during that stretch. Against the Nuggets in 22 minutes, Poole recorded 15 points (4-7 FG, 4-6 3Pt, 3-4 FT), six assists (no turnovers), three rebounds and one steal. Poole set single-game career highs of 21 points, eight assists, six rebounds, three steals and one block.