Caterham drivers Charles Pic and Giedo van der Garde have admitted they are still unsure over whether they will be driving for the Anglo-Malaysian team in 2014.
Recent speculation and comments by team owner Tony Fernandes have hinted the respected Finn Heikki Kovalainen, who was ousted by the team for 2013, could return in 2014.
This season the decision by Caterham to hire two inexperienced drivers back-fired as results and development stalled in the team's bid to join F1's midfield battle.
Frenchman Pic is expected by most to remain a Caterham driver for 2014 after showing some good form this season as well as having lucrative backing, but even he has admitted he still doesn't know where his future will be.
"Honestly, I still don't know what I will do (in 2014)," he told Italiaracing.
"I think it is logical to suppose that I will have a second year at Caterham, but in F1 situations can change so quickly that it's difficult to say right now where I will be."
As for teammate Van der Garde, he has been less impressive this season and is the likely man Kovalainen would replace.
Speaking to Dutch website autosport.nu, he admitted: "My management is in talks with several teams, including Caterham."
Staying on the topic of new drivers for 2014, Russian Danill Kvyat, who is currently racing in GP3, has admitted a move to Formula 1 would be "too early" for him.
The 19-year-old Russian is another product of Red Bull's young driver program and with another stable member Antonio Felix da Costa set to get the seat at Toro Rosso for 2014, Kvyat is concentrating on making his way through the junior formulas.
"Definitely I will not stay in GP3, so we are in the period where we are deciding what will be my future," he told Italiaracing.
"The logical passage for the Red Bull (development) drivers would seem to be to the Formula Renault 3.5 series. To go to Formula One, the others (sponsored by Red Bull) have passed through there.
"But it's not for me to decide, so I am waiting for Red Bull and will be ready to do anything they decide," he added.
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