It appears that the list of drivers to take the Red Bull cockpit vacated by Webber at end of season is being narrowed down.
Jul.17 (GMM) Red Bull team boss Christian Horner has hinted Daniel Ricciardo's test this week is a 2014 audition as the world champions look to replace the departing Mark Webber.
Unlike Ricciardo, Frenchman Vergne has not been called up to test the championship-leading RB9 at the Silverstone test.
"We're very keen to have a look at Daniel as a prospect for next year," Horner told British broadcaster Sky on Wednesday.
"It's a great opportunity for him," he added.
Horner also said 2007 world champion Kimi Raikkonen is in the running for the seat.
Asked if it is now a two-horse race between the Finn, who currently drives for Lotus, and Ricciardo, Horner admitted: "Essentially, probably."