Heitinga began his professional career at Ajax, where he made his debut in 2001. He quickly established himself as a talented defender and played an integral role in Ajax’s success in the Eredivisie. After four seasons with Ajax, Heitinga made a move to the English Premier League, joining Everton in 2009. During his time at Everton, Heitinga became a fan favorite for his solid defensive performances and leadership on the field.