Perez has been ousted in favour of the departing Ferrari driver as Lawrence Stroll's team transitions into the Aston Martin era.
The 30-year-old, who has been with the team for seven seasons, leaves the team on a high after scoring his maiden F1 victory in the Sakhir Grand Prix at the weekend, becoming the first Mexican to clinch a win for 50 years.
With the team on course to finish third in the constructors' championship, Perez has suggested Vettel will be piloting one of the best cars on next season's grid.
"Seb has definitely taken a great decision," he said. "He is coming to a team of pure racers, to a team that he will definitely have a good time and will enjoy it.
"The most important thing is he will have some good fun. I have no doubt that the team will be one of the strongest next year and he will definitely have a fantastic car."
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