Woods has not played since the 2015 Wyndham Championship while he recovered from multiple back procedures. He announced last month that he intends to return to the PGA Tour at next week's Safeway Open.
Parnevik told Golf Digest in a recent interview that he has played with Woods at Medalist Golf Club in Jupiter, Fla., and that the 14-time major champ seems ready to go.
"By the way, he's been hitting a lot of balls, and he's hitting it great," Parnevik said. "He's pounding it a mile and flushing everything. On the range at least, his trajectory and ball flight are like the Tiger we knew 15 years ago."
The field for next week's event in Napa, Calif., will be finalized on Friday. In his Sept. 7 update, Woods also announced intentions to play in the European Tour's Turkish Airlines Open Nov. 3-6, as well as the Hero World Challenge in December, which his foundation operates.
"My rehabilitation is to the point where I'm comfortable making plans, but I still have work to do," Woods wrote. "Whether I can play depends on my continued progress and recovery. My hope is to have my game ready to go."
Woods will turn 41 in December, but after watching him at Medalist Parnevik believes that Woods may still be able to turn back the clock.
"Comebacks are never a sure thing," Parnevik said, "but something tells me his might be spectacular."