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Red Bull team principal Christian Horner refused to rule out the possibility of Kimi Raikkonen racing for the team in 2014.
Raikkonen's manager, Steve Robertson, said earlier in the week that the Finn would not be moving to the reigning world champions next year.
But Horner insists that nothing has been decided.
An unwell Raikkonen skipped Thursday at Spa Francorchamps.
"Nothing is fixed yet. We said we would take the summer to mull things over, but there is no commitment yet."
"I wouldn't rule anything out at the moment. Until we finalise who is going to take the second seat, there is nothing much to say."
Horner was positive about the progress of Toro Rosso's Daniel Ricciardo but emphasised that the Australian's future is not decided.
"Daniel has done a very good job in the test he has done for us, and the recent races he has done for Toro Rosso," he said.
"But that doesn't mean it is a foregone conclusion."
"It is an important decision for us and we want to take the time to make the right decision and consider all the options. We are in a fortunate position where there are a lot of drivers who would like to be in that car."
