Melbourne City FC's Australian center-back Kai Trewin is joining New York City FC, as confirmed by Melbourne City's manager Aurelio Vidmar. The 24-year-old defender, who sometimes plays as a defensive midfielder, will leave the A-League club after a successful stint, including a trophy-winning 2024-25 season. Trewin set the tone at the back for Melbourne City during that season, leading the club in passes completed per match and accurate long passes per match. He will fill the role vacated by Justin Haak at New York City FC. The transfer was first reported by Joey Lynch of ESPN Australia, with the move expected to be finalized in the next few days. Trewin's departure from Melbourne City FC will be a significant loss for the club, given his impressive performances and contribution to the team's success. Aurelio Vidmar confirmed the news during a match broadcast, stating that Trewin had played his final game with Melbourne City FC. The transfer fee is reported to be more than a seven-figure sum, roughly $685,000 or more. Trewin's move to New York City FC will see him join midfielder Aiden O'Neill, who also featured for the Australia national team. Trewin has two career caps for Australia, both earned during the team's November 2025 friendlies in the United States. New York City FC's Head Coach Pascal Jansen had expressed his desire to sign a reinforcement for the back-four, and Trewin's signing will fulfill that requirement. The transfer will be New York City FC's first significant move under new Sporting Director Todd Dunivant.