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On paper, the team is expected to keep the Eric Boullier-linked fellow Frenchman Grosjean, who is strongly backed by important team sponsor Total.
And Kimi Raikkonen's 2013 contract has already been announced.
But Germany's Auto Motor und Sport said Raikkonen's place could actually be in doubt, because of an issue with how much bonus points money the Finn should receive.
"I don't know where this stuff comes from," the 2007 world champion's spokesman Riku Kuvajan is quoted by the Finnish broadcaster MTV3.
"I can't say anything about it."
As for Grosjean, the 26-year-old has had a generally better run since the low of his Monza race ban in September.
But he suffered a crucial spin in Austin last weekend, with an unnamed team member telling Speed Week: "His place (for 2013) remains at risk."
Grosjean, however, recovered to finish seventh in Austin, just behind Raikkonen.
"It reassures me," he is quoted by RMC Sport, "but still there is no signature so we are waiting until the end of the season."