Di Resta said he was talking to team bosses but it looked likely that he would lose his seat.
He said he that thought Force India was having discussions with rival driver Sergio Perez.
Di Resta said his manager had chatted to the Sauber Formula 1 team about a possible move and he said he was discussing driving for Mercedes-Benz in the DTM touring car series.
"(Force India) are speaking to me every two or three days," said Di Resta. "They may be interested. They may not. I believe they are in talks with Sergio Perez."
He added: "It's looking likely that I will not be driving."
Di Resta said the other Formula 1 possibility was Sauber.
"The only team that really has any possibility is Sauber," he said. "There has been nothing other than a chat with my manager."
Di Resta added: "I am speaking to Mercedes-Benz for DTM."
He was giving evidence at a High Court trial in London after being sued by former manager Anthony Hamilton - the father of Formula 1 star Lewis Hamilton - for wrongful termination of a contract.
He told the court of the "strange" behind-the-scenes situation after Lewis Hamilton severed managerial ties with his father.
Di Resta said sometimes Anthony Hamilton was friendly with his son and sometimes he would avoid him at "all costs".
Anthony Hamilton had earlier told the trial how he stopped being his son's manager in 2010.
Di Resta was asked about the situation in 2011.
"It was a strange situation," he said. "Mr Hamilton was in the paddock sometimes with us.
"Sometimes he would be very friendly with Lewis. Sometimes he and his wife Linda would be avoiding Lewis at all costs."
The hearing continues.