Toronto FC locked down Auro permanently on Monday by exercising its option to buy the defender from Brazilian club Sao Paulo FC.
The 22-year-old wingback — who initially joined the club on a season-long loan in February with the possibility of staying on long-term written into that deal — was one of the Reds’ biggest success stories in an otherwise forgettable season.
Auro, who was thrown into CONCACAF Champions League qualifying about a week after he signed with Toronto, adapted quickly to the demands of concurrent campaigns in that tournament and Major League Soccer, as well as the league and the Canadian Championship later in the summer.