2025 (Tacoma Defiance / Seattle): Signing with to First Team from Tacoma Defiance on March 10, Kossa-Rienzi made 30 all-competition appearances (17 starts) in 2025, scoring three goals and adding three assists in the regular season. While playing via Short-Term Agreement, he bagged a goal in his first appearance of 2025 for Seattle against LAFC (March 5). He also played in two matches for Tacoma Defiance, including a 90-minute shift against the Portland Timbers in 2025 Lamar Hunt U.S. Open Cup play.
2024 (Tacoma Defiance): Drafted 23rd overall by Seattle in the 2024 MLS SuperDraft. He made 25 appearances (21 starts) for Tacoma during 2024, including starts in both of Tacoma’s games in the MLSNP Playoffs, tallying three assists while completing 85 percent of his passes. He also appeared in six total matches (three starts) for Sounders FC via Short-Term Agreement from 2024-2025, including three matches this season, scoring two goals, including the game-winning goal against Phoenix Rising FC in the 2024 Lamar Hunt U.S. Open Cup.
Prior to signing with Defiance, Kossa-Rienzi appeared in 76 matches (68 starts) over four seasons at the University of Washington, scoring six goals while adding 11 assists. After recording an assist in his first game against Northwestern University, the Berkeley, California native scored two goals and added three assists during his sophomore year. He was named to the Pac-12 All-Conference First Team as a junior and senior, in addition to a United Soccer Coaches All-Far West Region Second Team selection following his junior year. Kossa-Rienzi also helped the Huskies to a second-place Pac-12 finish and run to the NCAA National Championship game as a sophomore, followed by a first-place conference finish as a junior before advancing to the second round of the NCAA Tournament.
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Signed by Sounders FC on March 10, 2025.
