Sebastian Vettel is to leave Ferrari at the end of the year after contract talks between the two broke down with no agreement.
The move, which is expected to be officially announced imminently, throws the future of the 32-year-old four-time world champion into doubt.
Spaniard Carlos Sainz, currently a McLaren driver, is among those who have been linked to Vettel's seat.
If Sainz leaves McLaren, one option for the team is Renault's Daniel Ricciardo.
The Australian had serious talks with McLaren in 2018 when he was weighing up whether to leave Red Bull, before finally deciding to move to Renault.