Mata said: "Joining San Diego FC as a partner is an exciting opportunity to help build something truly special in a city and league that are experiencing incredible growth.
"The commitment of both this Club and Right to Dream (a to community impact, excellence, and a vision for long-term success aligns perfectly with my own values. I look forward to contributing my experience and passion for the game and working alongside everyone here to build a Club that inspires both on and off the pitch."