"He is moving now, little by little," Siegfried Fischbacher said in an interview on NBC's "Today" show. "(He's) speaking a few words ... but this develops also every day."
Roy had been off his respirator for two weeks, Fischbacher said, and had recovered enough to spend Christmas in Las Vegas, where the duo were performing at the time of the attack. He is currently a patient at UCLA Medical Center in Los Angeles.
"I think he's going to recover everything," Fischbacher said. "I have no doubt."
Fischbacher downplayed Roy's injuries from the Oct. 3 attack, describing the illusionist's wound as "a little punch hole" on the left side of his neck. Fischbacher said a stroke Roy suffered after the incident resulted from blood pressure medication that sometimes made him feel faint.
Horn, 59, was mauled by one of the white tigers featured in the duo's show at The Mirage hotel-casino in Las Vegas. Fischbacher has suggested that the animal was trying to help Horn, but other animal experts disputed that.