Initially, names such as Max Verstappen and Carlos Sainz were linked with the seat, but Mercedes eventually opted for a driver from their junior programme to complete their lineup.
The team revealed at the Italian GP that Kimi Antonelli would race alongside George Russell in 2025, with the youngster impressing in F2 and in a series of tests.
Now, with Bottas officially announced as not being renewed at Sauber, Mercedes have dropped a huge clue on their social media that the 10-time race winner could return.
The team posted a picture of sacked Sauber star and former driver Valtteri Bottas to their X account, where he was depicted wearing Mercedes overalls and above a tweet stating: '“I miss him” and it’s just a sports player'.
Whilst the image may be a tribute to the Finn’s departure from the F1 grid, the post did not contain a caption and has only enhanced existing speculation about his return to Mercedes.
Bottas took to social media after Sauber announced the signing of Gabriel Bortoleto, and stated that despite being axed that he was 'looking forward' to the future.
“After three years at @stakef1team_ks we decided to part ways,” he wrote.
“I want to take this opportunity to thank each & everyone in the team, everyone I’ve worked with, and especially you guys out there for the support then, now and in the future.
“Looking forward for what’s to come!”
If Bottas does indeed return to his former home, it will be fascinating to see how his experience can benefit what is quite a young driver pairing next season.