While Bottas continuing with the Swiss outfit was a formality, there had been some question marks over Zhou.
However, the Chinese driver has now been signed for a third year with the team, which is expected to revert to the Sauber identity for the next two years, ahead of the full transition to the Audi name in 2026.
Current Formula 2 championship leader Theo Pourchaire will also remain in his reserve and simulator driving role.
"The decision to continue our journey with our driver line-up unchanged is testament to the investment we have made in our project," said team representative Alessandro Alunni Bravi.
"Nothing in F1 changes overnight, and we have taken a conscious decision to focus on stability and to keep building our team up together as we embark on an important period of transition.
"Valtteri and Zhou are drivers of known talent and skill, and they work really well together. They are well-matched and can push each other.
"Valtteri has taken a real leader's role within the team, pushing us all to give our best. Zhou has made impressive steps forward in the last two years and we expect him to continue on this trajectory in 2024.
"Now the baton is back to us – we have to give both drivers a good car and put them in the best conditions to perform."
Source: Autosport