In August 1957 he joined the Italian club Juventus F.C. for a then-British-record £65,000 transfer fee, almost doubling the previous record. The transfer was notable as Charles became one of the first British professional players to be signed for an overseas team after John Fox Watson led the way moving from Fulham to Real Madrid in 1948.
He was never cautioned or sent off during his entire career, due to his philosophy of never kicking or intentionally hurting opposing players. Standing at 6 feet 2 inches, he was nicknamed Il Gigante Buono – The Gentle Giant.