The fullback arrived in the summer from Cerro Porteno and has been working his way to full match fitness with the U21s.
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"For Paraguay, to have a player playing here at United is huge," he told club media. "I think for Paraguayans they’re very proud to have someone from there playing in a club as big as Manchester United.
"It is an amazing, unique feeling to represent your country for all the people of Paraguay. I don’t know, it has no explanation - for my family it is an immense sense of pride to see me play with my national team."
On his country, Leon added: "The people of Paraguay will surprise you. They’re so kind, even if they don’t have much, they will always help you."