Alvarez, who was born in Houston to Salvadoran parents, qualifies to play for El Salvador under FIFA's new rules relaxing the restrictions on players switching their allegiance.
Also called up was San Jose Earthquakes teammate Ramon Sanchez and first-year New York Red Bulls defender Alfredo Pacheco.
Other foreign-based players are former D.C. United player Eliseo Quintanilla, who plays for Ermis Aradippou in Cyprus, and Rodolfo Zelaya of Mexico's Leon.
EL SALVADOR ROSTER:
Goalkeepers --Miguel Montes (Aguila), Dagoberto Portillo (Alianza).
Defenders --Deris Ariel Umanzor (Aguila), Marvin Gonzalez (FAS), Mardoqueo Henriquez (FAS), Manuel Salazar (Luis Angel Firpo), Victor Turcios (Luis Angel Firpo), Alfredo Pacheco (New York Red Bulls, USA), Ramon Flores (FAS), Alex Escobar (Isidro Metapan), Luis Miguel Hernandez (Aguila).
Midfielders --Eliseo Quintanilla (Ermis Aradippou, Cyprus), Denis Alas (Luis Angel Firpo), Osael Romero (Vista Hermosa), Ramon Sanchez (San Jose Earthquakes, USA), Juan Carlos Moscoso (FAS), Salvador Coreas (Municipal Limeno).
Forwards --Arturo Alvarez (San Jose Earthquakes), Rodolfo Zelaya (Leon, Mexico), Rudis Corrales (Aguila), William Reyes (FAS).