The German will arrive ahead of the Swiss outfit's transition to Audi for 2026. The manufacturer has already acquired a 100 per cent stake in the Sauber Holding AG, who are operating as Stake F1 Team in the sport this season.
On his social media accounts this week, however, Bottas posted a picture of an Audi car with his racing number, 77, on the side.
Immediately, fans jumped to the conclusion that Bottas could be suggesting he will stay with the team as it becomes Audi.
Valtteri Bottas has just posted an Audi with #77 on the side, on his Instagram story 👀👀 is that a hint or am I a conspiracy theorist 👀👀 #F1pic.twitter.com/pYr9A7pTec
Bottas tagged Stake F1 Team in his X post, and wrote: "Fun day in California. More to come eventually about our secret mission with Hyland."
It is unclear as yet what the 'secret' mission involves. It could be unrelated to Bottas' personal future with the team, though his fans will hope a new deal is being worked on simultaneously.
If Bottas is unable to secure a new contract at the team, he is likely to be out of F1 for good, with Alpine likely his only other realistic chance of extending his career in the sport.