Albion can confirm Jorge Alarcón and Jaime Monroy have joined the backroom staff of new Head Coach Carlos Corberán.
The pair, who have worked with the Baggies boss at his previous clubs, team up with James Morrison and Gary Walsh in the first-team setup.
Alarcón, 37, assisted Corberán at Huddersfield Town and Olympiacos, while former Barcelona youth coach Monroy, 40, worked alongside Corberán at Leeds United, before joining him in Greece earlier this year.