Red Bull advisor Dr Helmut Marko has confirmed that Kimi Raikkonen is not a part of the team's plans for 2014.
With Sport Bild reporting Daniel Ricciardo will be confirmed at Red Bull at this week's Belgian Grand Prix, speculation that Raikkonen has chosen to rejoin Ferrari has increased.
Marko was asked about the Raikkonen-to-Ferrari reports by German newspaper Bild and said: "I'm not nervous. Don't forget that we still have Vettel."
This is the clearest sign yet that the Austrian team has lost out on the services of Raikkonen, though Marko would refuse to confirm that Ricciardo was the man wanted to replace Mark Webber at the team next year.
Marko insisted: "This (Ricciardo's signing) is not fixed yet."
Indeed, Toro Rosso team boss Franz Tost would not be drawn on the reports.
"I don't know", he said when questioned about the future of his talented young driver.
Raikkonen too remains quiet over his future. The Finn spent Friday testing the GP3 chassis at Barcelona's Circuit de Catalunya as the feeder series looks towards the 2014 development.
Speaking to the GP3 website he said the car was "actually fun to drive" though when speaking to Finland's Turun Sanomat, he joked: "It was good, but they should think about putting an engine in the car."
Although a return to Ferrari would seem logical for Raikkonen, Lotus are currently having financial trouble as a deal with a consortium called Infinity Racing seems to have stalled. In addition, Ferrari could well be looking to replace the under-performing Felipe Massa for 2014.
Should the Ricciardo switch be confirmed at Spa, it would clear the way for Antonio Felix da Costa to make his move up from Formula Renault 3.5 to Toro Rosso where he would likely partner Jean-Eric Vergne for 2014.
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