Although both Mercedes drivers' contracts are due to expire at the end of the season, team boss Toto Wolff insists he is not yet considering replacements from elsewhere.
Lewis Hamilton is expected to sign a new contract with Mercedes in the near future, but negotiations appear be dragging on and there is no news of when a deal will be announced. Meanwhile, teammate Valtteri Bottas is on a single-year contract and faces a crucial few months as he tries to convince Mercedes to keep him beyond the end of the year.
The driver market for 2019 has the potential for big changes among the top three teams, with Daniel Ricciardo keeping his options open now his Red Bull contract is coming to an end and Kimi Raikkonen also out of a Ferrari contract at the end of the season.