The 35-year-old, who secured all 10 of his career wins across his five seasons with the Mercedes, has now made a shock return to the team, backing up the duo of George Russell and young prodigy Kimi Antonelli.
Off-track, Mercedes will hope Bottas' experience can add a lot as they look to develop their car and get back to winning ways.
Although he will not be on the grid for lights out in Melbourne, Bottas has not given up on a return to the sport full-time, so long as the right opportunity presents itself.
He has admitted, however, that retirement is an option if that opportunity does not arise.