Philadelphia Union's Cavan Sullivan, a 16-year-old American-German midfielder, has a pre-existing agreement to join Manchester City when he turns 18. Real Madrid and Barcelona have also become interested in him. The Spanish clubs are interested in attempting to alter Sullivan's plan to move to the English champions. Sullivan's current contract with Philadelphia Union, which is valid until 2028, includes a clause that provides for his transfer to City. In the 2025/2026 Major League Soccer season, Sullivan has 6 goals and 5 assists in 23 appearances. His current market value is €4.50m, according to Transfermarkt. Reports from December 2025 indicated that the future transfer to Manchester City was for a deal worth approximately €4.3 million.