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."