Kimi Raikkonen will test for Sauber next week in Abu Dhabi ahead of him joining the squad for the next two seasons.
Raikkonen confirmed in the summer that he would be moving back to the team where he made his debut, with impressive rookie Charles Leclerc moving the other way.
The Finn scored his first race win in his five year stint with Ferrari In the USA last month and has been in good form recently, showing no signs of slowing down because of his age.
He will be 41 by the time his contract with the Swiss team comes to an end.
Leclerc will also run for Ferrari in the post-season test, with Pierre Gasly testing for Red Bull and Daniil Kvyat driving a Toro Rosso once again.
Lance Stroll could also make an appearance for Force India with his move almost a certainty now.