Williams have no comment to make on speculation of an approach from Mercedes for the services of Valtteri Bottas.
Mercedes are seeking a replacement for Nico Rosberg after the German sensationally announced his retirement from Formula One after winning the world title at the final grand prix of the season in Abu Dhabi last month.
Bottas has been talked up as a potential new team-mate for Lewis Hamilton, while Fernando Alonso and Sebastian Vettel have also been linked with the seat.
The possibility of Mercedes promoting junior driver Pascal Wehrlein, who impressed in his debut season with Manor last term, has also been raised.
But it is Bottas who appears the clear favourite, with reports emerging over the weekend that Williams had rejected an offer to release the Finn from his 2017 contract with the team.
However, Williams refused to comment on those claims when approached by Omnisport.
Bottas entered F1 in 2013 and has gone on to start 77 grands prix, claiming nine podiums and 411 points in his career.