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The actor, who played the central character in the first three instalments of the Terminator franchise, had previously hinted that he would be making a brief appearance in the next outing.
Speaking to MTV News about the status of Schwarzenegger's cameo, McG said: "Not yet. In fact, today is April 10, I'm doing this interview on April 10 and we don't know if Schwarzenegger is in the movie or not. It's not clear. I can say that."
However, the director insisted that he was still open to the possibility of Schwarzenegger returning, but admitted: "It's a complicated, delicate balancing act as of now. The jury is still out."
Terminator Salvation opens in the US on May 21 and in the UK on June 3.
> Linda Hamilton in 'Terminator Salvation'
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