Since losing his Caterham seat at the end of last year, 28-year-old Petrov has split with his long-time manager Oksana Kosachenko, who is now Caterham's commercial director.
Petrov also admits that his own search for new Russian backing has proved frustrating.
"Unfortunately only companies from the west have contacted us so far," he is quoted by Speed Week, "which is a shame, because ideally I'd like to go back to formula one with Russian partners."
Nevertheless, Petrov insisted his focus remains on a F1 comeback for 2014.
"The negotiations are in progress and I'm working hard," he is quoted as saying.
"I have received many offers from other series and attended their races," added Petrov, "but formula one is my priority.
"I will use all my strength to go back to F1, because it's my life," he said.