Pittsburgh Pirates

Alldred was drafted by the Pittsburgh Pirates in the 24th round, 714th overall, of the 2018 Major League Baseball draft. He split his first professional season between the Low-A West Virginia Black Bears and the Single-A West Virginia Power, pitching to a 1.80 ERA with 32 strikeouts in 20 total games. In 2019, he played for the Single-A Greensboro Grasshoppers, logging a 4–1 record and 4.20 ERA with 63 strikeouts in 60 innings pitched across 39 games.^[2]

Alldred did not play in a game in 2020 due to the cancellation of the minor league season because of the COVID-19 pandemic.^[3] He split the 2021 season between the Double-A Altoona Curve and Triple-A Indianapolis Indians, recording a cumulative 4–0 record and 2.18 ERA with 59 strikeouts in 66 innings of work across 33 total games.

He was assigned to Indianapolis to begin the 2022 season. Alldred was selected to the 40-man roster and promoted to the major leagues for the first time by the Pirates on May 11, 2022.^[4] He made his MLB debut the next day, striking out one batter over one scoreless inning in relief in a 4–0 loss to the Cincinnati Reds at PNC Park.^[5] On May 24, Alldred was designated for assignment by the Pirates.^[6] He cleared waivers and was sent outright to Indianapolis on May 28.^[7] In 42 games for the Indians, he recorded a 4.07 ERA with 62 strikeouts across 66+1⁄3 innings.

Alldred returned to Indianapolis for the 2023 season. In 31 appearances (17 starts), he compiled an 8–8 record and 5.20 ERA with 98 strikeouts across 105+2⁄3 innings pitched.^[8] Alldred made 9 starts for Indianapolis in 2024, struggling to a 6.88 ERA with 34 strikeouts across 34 innings pitched. He was released by the Pirates organization on May 28, 2024.^[9]

Kia Tigers

On May 29, 2024, Alldred signed with the Kia Tigers of the KBO League as a temporary replacement for Wil Crowe, who had suffered an elbow injury.^[10]