Magallán (born in La Plata, September 27, 1993) joined Ajax from Boca Juniors in January 2019. The Argentinian made his debut for the Ajax first team on January 24, 2019 during a cup match against sc Heerenveen: 3-1. So far, the defender has played seven official matches for Ajax.
As a member of the first team, Magallán was an Eredivisie champion in 2019 and won the Dutch Cup. He also won the Johan Cruijff Shield that year. Last season, the Argentinian was loaned out to the Italian club, FC Crotone, and in 2019/2020 to Deportivo Alavés from Spain.