Red Bull motorsport boss Helmut Marko says the success achieved in Formula E by former junior bull Jean-Eric Vergne doesn't make the Frenchman eligible for a second shot at F1.
Vergne raced with Toro Rosso in F1 for three seasons between 2012 and 2014, but was dropped from Red Bull's junior programme thereafter, a fate that had previously befallen Sebastien Buemi.
However, both drivers found success in Formula E, with Buemi securing the title in the all-electric series' second season with Renault e.dams and Vergne consecutively winning the last two championships with DS Techeetah.
Red Bull's current junior programme is well populated according to Marko, but the energy drink company's bull pen also lacks a contender capable of immediately stepping up to F1 if necessary.
But Marko has dismissed any potential return to the F1 fray of reigning FE champion Vergne.
"Vergne is now winning in Formula E, but the requirement profile isn't comparable to what we need in Formula 1.," the Austrian told Motorsport-Total.
"If he returned, he would be a complete rookie. It takes a whole season just to get used to the characteristics of the Pirelli tyres."
©DSTecheetah
Marko says that if anything, Vergne's triumphs in Formula E offer further validation of the efficiency of Red Bull's junior programme which has seen Sebastian Vettel clinch multiple world titles and Daniel Ricciardo and Max Verstappen become bona fide Grand Prix winners.
"We are very satisfied with that and proud of it," added the Austrian.
"We are now being copied on a large scale by others, but no one comes close to the success we have achieved."
Gallery: The beautiful wives and girlfriends of F1 drivers
Keep up to date with all the F1 news via Facebook and Twitter
Lewis Hamilton had pole position within his grasp at the inaugural Spanish Grand Prix. Then,…
George Russell will start only sixth at the Spanish Grand Prix, a frustrating outcome after…
Lando Norris emerged from the inaugural qualifying session at Madrid’s Madring looking almost as surprised…
Lando Norris snatched a dramatic Spanish GP pole by just 0.011s from Kimi Antonelli, with…
Lando Norris unexpectedly snatched pole position from Kimi Antonelli by just 0.011 seconds in a…
Full results from qualifying for the Spanish Grand Prix at Monza, round 13 of the…