"During these years, Kimi's contribution to the team, both as a driver and on account of his human qualities, has been fundamental. He played a decisive role in the team's growth and was, at the same time, always a great team player."
The 38-year-old Raikkonen has started 287 grands prix, winning 20 since his debut in 2001 with Sauber, the team he will race for again in 2019.
Raikkonen moved back to Ferrari in 2014.
"As a World Champion for Scuderia Ferrari, he will always be part of the Team's history and family. We thank Kimi for all of this and wish him and his family a prosperous future," the team added.
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