Sauber will announce during the course of this weekend's Brazilian GP who will partner Nico Hulkenberg next season.
Hulkenberg will join Sauber for next season as Sergio Perez is departing for McLaren having signed a long-term deal with the Woking outfit.
However, whether Sauber will have an all-new line-up or retain Kamui Kobayashi remains to be seen.
The Japanese driver is keen to hold onto his race-seat but faces stiff competition from TelMex-backed Esteban Gutierrez.
"We have always said it will be 'in the season'," Sauber team principal Monisha Kaltenborn told Autosport.
"So it will be before Brazil, in Brazil or a few hours after the race."