Kai Wagner is a defender in Philadelphia Union’s first-team squad for the 2026 MLS season. He was born on 15 February 1997 in Geislingen an der Steige, Germany.
His senior career started at SSV Ulm in 2015, and he went on to play for Würzburger Kickers and Birmingham City. He joined Philadelphia Union in 2019.
Since his first senior season in 2015/16, Wagner has made 348 club appearances and scored 12 goals in all competitions for 4 clubs. His most productive season in front of goal was 2023, when he scored 3 times in 42 games for Philadelphia Union. His busiest campaign was 2024, with 45 appearances. The full season-by-season record is in the Stats section of this profile.