According to these rumors, Mercedes is doing a talk with Gasly in case Hamilton will retire or for 2023.
Source: https://www.formulapassion.it/motorsport/formula-1/f1-team/mercedes-occhi-su-gasly-per-il-dopo-hamilton-599459.html
What a surprise, why Gasly? I almost can't imagine it, Russell will have to prove himself next season whether he can deliver top performances in a top team all year round, but I wouldn't put it past him to stand up to the pressure, especially with Hamilton as a team mate 🤔.
First of all i don't really think that Hamilton will retire. He is not that old yet with 36 years for a race driver and i would say he could compete at the highest at least 4 or 5 more years, just look at Alonso and how well he did. In the end hamilton decides for himself if he wants to keep on racing or if he wants to quit. Rosberg quit immediately after he won the championship back in 2016 and maybe hamilton quits now after he lost that championship in such a dramatic way. Maybe he is also afraid that Mercedes won't be in such a strong position now with the new cars and he does not want to risk it to drive for the positions 8 to 12 or so.