The 24-year-old defender, who has 33 caps for the Dutch national side, announced in March that a five-year deal had been agreed with the Primera Liga outfit and is set to join the capital club for a reported 10million euros.
A statement on the Atletico website read: "John Heitinga has passed a medical examination on Sunday in Madrid. Heitinga is considered one of the most flexible defenders in current world football. He is also considered one of the most experienced players despite his young age."
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