With Nico Hulkenberg seemingly on his way out of Sauber, the 41-year-old Barrichello has emerged as a serious contender.
The Brazilian, with an F1 record 322 starts behind him, left the sport at the end of 2011 after being ditched by Williams.
Barrichello then competed in IndyCar in 2012, whilst this year he has been restricted to Stock Car Brasil.
Asked about Barrichello's prospects of joining the team, Kaltenborn said: "I always have to give you the same answer on that - we will announce in due course, and there are a couple of options out there."
Then specifically with regard to Barrichello, Kaltenborn added: "We know what he has, his experience, and we know he'd like to come back, so let's see."
Rumours, however, Barrichello will replace either Hulkenberg or team-mate Esteban Gutierrez for the final race of this season in Brazil have been firmly denied.
Kaltenborn said: "I don't see any possibility there because we have no reason to change our two drivers for that race."