A native of Columbia, Missouri, Klein was selected 30th overall in the 2023 MLS SuperDraft by St. Louis CITY SC. He went on to make 16 appearances in Major League Soccer across two seasons, recording one goal and one assist, while also playing a key role for St. Louis CITY2. Across two seasons in MLS NEXT Pro, Klein tallied 19 goals and 10 assists in 48 appearances, establishing himself as a consistent attacking threat.
Prior to turning professional, Klein enjoyed a standout collegiate career at Saint Louis University. Across five seasons, he made 88 appearances, recording 29 goals and 27 assists. He was a four-time All-Conference selection and was named Atlantic 10 co-Offensive Player of the Year in 2022 after leading the NCAA in assists during the 2021 season.
