The 21 year-old moves to Villarreal as a free agent after coming off contract at Velez this week.
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Regarded as an energetic box-to-box midfielder, Fernandez moves to Spain after a difficult spell plagued by injury.
Villarreal management are convinced they've pulled off a coup, with Fernandez penning a deal to 2031.
Fernandez came right through Velez's system and in 48 games, he scored 6 goals and provided 9 assists.