The Portuguese side have reached an agreement in principle with Rosario Central to sign both Di Maria, 19, and 24-year-old Andre Diaz, in a six million euro (£4million) transfer.
Forward Di Maria was part of the Argentina side which clinched the FIFA Under-20 World Championship in Canada last week and is seen as a replacement for Portugal international Simao Sabrosa, who completed his transfer to Atletico Madrid on Friday.
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