Alfa Romeo has seen fit to rejuvenate ahead of the season, with F1 entering a new era in terms of the regulations in 2022.
Between 2015 and 2018, Kimi Raikkonen and Sebastian Vettel were teammates at Ferrari and developed a strong bond.
The 42-year-old Finn, a true classic of the sport and a former world champion, retired from racing at the end of last season.
Bottas was backed up by Felipe Massa at Williams before joining Mercedes to accompany Lewis Hamilton at Mercedes.
Valtteri Bottas, who will join Alfa Romeo for the 2022 Formula 1 season, won five constructor's championships during his time at Mercedes.
Guanyu Zhou will become China's first-ever Formula 1 driver in 2022, having been signed by the Alfa Romeo team for the upcoming season.
Signing Zhou from Formula 2 means there is no race seat for Antonio Giovinazzi, who had hoped to retain his spot for the next campaign.
Valtteri Bottas will leave Mercedes as a key part of the side who won four constructors championships. But Alfa Romeo will pose a challenge.
Verstappen had earned the pole position in qualifying on Saturday when he out-qualified his title challenger Hamilton.
The future of most Formula 1 drivers seems secure for 2022, but there are some names in the F1 drivers market still up for grabs.