He then moved to the United States to join the Washington Diplomats for the 1980 North American Soccer League season,[3] where his teammates included Thomas Rongen and former Dutch international Johan Cruyff.
Despite a fee of 5.5 million pesetas, Luna didn't play a competitive match for Valladolid before signing for Segunda División side Elche in the middle of the 1981–82 season.
In February 2006, La Liga club Deportivo Alavés dismissed their coach Juan Carlos Oliva after just five games in charge, after chairman Dmitry Piterman accused him of insubordination.
[7] Luna took control until the end of the season,[8] making his La Liga coaching debut in a tough away game against Real Madrid at Santiago Bernabéu Stadium, which Alavés lost 3–0.
He returned to management in Spain when third-tier side Cerro Reyes sacked José Luis Diezma in December 2010, with Luna taking over until the end of the season.
[12][13] The club were in crisis, finished bottom of the table, and were relegated to the Regional Preferente de Extremadura as punishment for failing to fulfill all their fixtures and not paying their players.