The 59-year-old star, suffered the injury when he shot film scenes in the ring just before the middleweight World Title clash between boxers Jermain Taylor and Bernard Hopkins in Las Vegas earlier this month.
After suffering a vicious blow to the head the movie star fell unconscious, but the film crew failed to raise the alarm—believing he was still acting.
Stallone's mother Jackie says, "At first everyone thought Sylvester was acting when he fell to the floor, but it was serious.
"Fortunately he's recovered now."
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