The Brit joined the squad as their reserve driver in 2010 and stepped up to a race seat for 2011.
Di Resta enjoyed his best season in the sport in 2013 as he scored 48 points and finished in 12th place in the championship, which included a fourth place finish in Bahrain.
Di Resta was speaking at the High Court in London as part of a trial against Anthony Hamilton, with Hamilton suing his former client for wrongful termination of contract.
"Force India are speaking to me every two or three days," he said.
"They may be interested. They may not. I believe they are in talks with Sergio Pérez. It's looking likely that I will not be driving."
Force India has already confirmed that Nico Hulkenberg will return to the team for 2014.
Di Resta acknowledges that there is a slim chance of a seat at Sauber, otherwise he will return to DTM, where he won the title in 2010.
"The only team that really has any possibility is Sauber. There has been nothing other than a chat with my manager."
"I am speaking to Mercedes-Benz for DTM," he added.