[1] In 2007, he was named manager of Tercera División side Íscar,[2] achieving mid-table positions during his three-season spell at the club.
[4] In January 2014, Retamero moved to Libya and joined Al-Ittihad Club as their technical director;[5] he was later also given the role of under-19 manager.
He left the country in June, shortly after the start of the Libyan Civil War, and moved to Bahrain as a director of the national team.
[10] In December 2016, after a short spell at Budaiya Club in Bahrain, Retamero signed for Ulaanbaatar City FC, replacing countryman Rodrigo Hernando.
On 2 January 2018, Retamero was announced as manager of CD Victoria CF, a youth football club from his hometown.