Lotus team boss Eric Boullier confirmed on Friday that progress is being made with Quantum Motorsport regarding an investment deal with the Enstone outfit.
Boullier hinted that progress had been made since last week's race in Austin and is confident that the deal will be wrapped by next week.
"Well, there is still some discussion ongoing, especially now between bankers," said Boullier.
"The process is not fully completed but I think part of it has been done, which is obviously a good sign for the weekend and we hope that everything is closed by early next week."
How soon Lotus are able to complete the deal is likely to have an impact on which driver is recruited to replace Kimi Raikkonen, with Nico Hulkenberg, Pastor Maldonado and Sergio Perez currently the favourites to secure a berth alongside Romain Grosjean.
Boullier also played down reports about the alleged dubious business practices of Quantum's chief Mansoor Ijaz.
"We have very serious proof of funds and good compliance of what is Quantum Motorsport," Boullier said during Friday's FIA press conference at Interlagos.