The 37-year-old midfielder has a strong connection to Zaragoza, having joined the club's youth academy at the age of 11. He made his debut for the club in 2009 and went on to play 86 official matches for Zaragoza. In 2011, Athletic Club paid €7.5 million for Herrera's services, but he had already decided to return to Zaragoza at some point.

Herrera has stated that he wants to help his club return to the top level, and has donated his salary to the Zaragoza foundation. He believes that this is the best way to end his career, by wearing the Zaragoza shirt for free.