Herrera, who turns 37 in August, started his career with Zaragoza before moving to Athletic Bilbao in 2011 and then to Old Trafford in 2014.
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The midfielder played for Boca Juniors in Argentina in the 2025-26 season before returning to Zaragoza, relegated last season, on a one-year deal.
"Herrera, a product of Real Zaragoza's youth academy, returns home at the age of 36 after a long and successful career defending the colours of some of the best clubs in the world," said Zaragoza in a statement.