The new film tells the story of Stallone's efforts to bring his boxing movie Rocky to the big screen in the 1970s, with Anthony Ippolito playing the actor.
While it was previously claimed that Stallone liked the film, the screen star set the record straight during an interview at The 92NY in New York to promote his memoir The Steps.
Responding to the interviewer asking what he thought of I Play Rocky, he said: "Kind of mixed because I'm not dead yet. Aren't we jumping the gun a little bit"?
However, when he saw a clip of Ippolito in character as him, Sylvester was left stunned by the incredible likeness.
"I actually thought it was me the first moment, there were a couple of angles," he said.
Of meeting Stallone ahead of filming, Ippolito previously told The Hollywood Reporter that "it was a lot to take in".
"It was very overwhelming and daunting. There's a lot going on in my head, but I was really just trying to listen as much as possible and hear his perspective."
I Play Rocky is already being tipped as an Oscar contender ahead of the 2027 Academy Awards.
If the film lands nominations, it would follow in the footsteps of Rocky, which landed 10 nods and won three Oscars including the coveted Best Picture prize in 1977.
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