The 24-year-old Spanish left-back has joined the La Liga club on a two-year deal.
La Liga side Eibar, who finished 18th last season but avoided the drop after 13th-placed Elche were relegated over unpaid taxes, have confirmed the signing of the full-back on a deal until 2017 following the termination of his Villa contract.
The Spanish left-back would go on to make 17 further appearances over the following months but then suddenly found himself dropped from the side in mid-January, as Ryan Bertrand was brought in on loan from Chelsea.
Failing to make another appearance for the rest of the 2013-14 campaign, he was sent out on a season-long loan to Serie A side Verona in the summer but did not see a single minute of action before switching his spell to Spezia during the winter transfer window.
His fortunes did not improve a division down, however, as he managed just four appearances and was out of the squad for the final 10 games of the term.
Speaking on his client’s woeful campaign in May, agent Graziano Battistini told TG Gialloblu: "Unfortunately it did not work, he ran into a bad season.
"I was convinced to bring to Verona a player who can do important things. The coach did not see fit to give him playing time and he will have had his reasons.
“He is the classic Spanish full-back, maybe he is more suited to attacking than defending. I will not go into too much about, I regret only for the player who is a dear boy and paid for this situation.”
His recent struggles in mind, it is no surprise that Tim Sherwood opted to ship Luna out as he revamps his squad in his first transfer window in charge but, given the initial promise he showed at Villa Park, a switch back to Spain just might be the move he needs to get his career back on track.