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The governor of California, who starred in the first two movies in the series, has long been rumoured to appear in a cameo role in the latest instalment, the Los Angeles Times reports.
However, director McG has said that the actor's appearance has not been confirmed.
In a webcast, Schwarzenegger told blogger Bill Bradley: "I made it very clear that I don't have the time to do the movie.
"I said that I would be willing to be in the movie if they get the technology together, and so they are working on that right now."
He added: "I think it's cool to continue on with the franchise...in case I want to jump over again and get into the acting after I'm through here."
Terminator Salvation hits cinema screens on June 3.
> Click here to watch the new trailer for the movie
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