Webber 'in autumn' of career - Horner
Red Bull team chief Christian Horner has said in a German newspaper interview it is impossible to say who will be driving alongside three-time reigning world champion Sebastian Vettel next year.
Red Bull will make a decision at the end of the summer on the 2014 driver team, he told Sunday's Welt am Sonntag newspaper.
Vettel's teammate Mark Webber is "a very capable driver," said Horner. "But he is the autumn of his career and no longer in the spring," he added.
The 36-year-old Australian has a contract until the end of the season with Red Bull. Relations between Webber and Vettel remain tense after the 25-year-old German won the Malaysian Grand Prix by ignoring team orders to overtake his teammate.
Recent Formula One speculation has linked Kimi Raikkonen with a move from Lotus to succeed Webber next season.
"It is impossible now to say who will be driving alongside Sebastian next year. It's clear that every driver would at the moment like to be sitting in a Red Bull," Horner is quoted as saying.
"But we are completely behind our current driver pairing. We will only be considering 2014 at the end of the summer."