Carlos Sainz's management has reportedly started negotiations with the Mercedes team,

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https://autodromef1.quora.com/The-rumblings-of-negotiations-between-Carlos-Sainz-and-the-Formula-1-Mercedes-team-have-sent-shockwaves-throughout-the-r?ch=10&oid=154154010&share=40e5f116&srid=37paNh&target_type=post