The Premier League club announced that the 25-year-old had agreed to a contract until June 2028, with the Europa Conference League winners.
West Ham manager, David Moyes who said the midfield area was one the club had been keen to strengthen this summer, expressed belief that Edson will complement the other options in that department.
Alvarez, who started his senior career with Mexico City-based Club America, won two Eredivisie titles during his four seasons with Amsterdam side, Ajax.
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