Esteban Gutierrez's switch to the Haas Formula 1 team is set to be announced next Friday in Mexico, ending weeks of speculation about the Ferrari test driver's future.
The Mexican has long been favourite for the second seat alongside Romain Grosjean, but the team has been reluctant to confirm its plans up until now.
However, sources close to the deal have told Motorsport.com that the deal will be confirmed on the Friday afternoon of the Mexican Grand Prix.
Haas dropped a firm hint about the Gutierrez plans by saying on Saturday his team will announce its drivers in Mexico City next Friday.
Grosjean said he had not been officially informed about the plans for his teammate, however.
"I know nothing of my teammate," he said. "Haas will announce at the right time. But I want a partner with experience."
Gutierrez has worked at Ferrari this season, and his place at Haas is believed to have been helped by his association with the Italian team which is supplying engines and other technical input to the new outfit.
Having raced for Sauber for two seasons, Gutierrez lost his race seat at the end of last year as the Swiss outfit opted for Felipe Nasr and Marcus Ericsson instead.