Red Bull team principal Christian Horner says it is "essentially" a two-horse race between Kimi Raikkonen and Daniel Ricciardo to replace Mark Webber.
Following Webber's decision to retire at the end of the season, Horner said at the British Grand Prix the shortlist to join Sebastian Vettel at Red Bull in 2014consisted of Raikkonen, Ricciardo and Jean-Eric Vergne. However, with Red Bull deciding to test Ricciardo at Silverstone this week, when asked if that meant it was a straight choice between two drivers and that Vergne is out of the running Horner replied: "Essentially, probably.