The Argentina midfielder moves to Inter Miami for a mooted fee of €15m.
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Beckham said, "Rodrigo is a player I have admired for many years. As a leader, he has given so much to the teams he has played for, especially his national team, Argentina.
"He brings experience, passion, and quality to our team and our city. I am thrilled to welcome another World Cup-winning player not only to Inter Miami, but also to MLS."
Meanwhile, De Paul said: What brings me to Inter Miami is the desire to compete, win titles, and write pages in the club's history.
"It's a club that is preparing to become great, to have a long history, so that many people can follow this incredible team."