The golf legend made his first competitive appearance since February in the Bahamas last month and finished a respectable tied-ninth ahead of the likes of Dustin Johnson and Justin Thomas to name but a few.
His strong performance has many current and former professionals excited about Woods could be capable of.
Some have been more cautious in their expectations on what Woods should be aiming for.
But his former swing coach Harmon believes Woods can surprise everyone in the majors.
“I learned a long time ago never to say never when it comes to Tiger Woods,” Harmon told the Golf Channel.
“He’ll prove you wrong. I think he can win again. Whether or not he can win a major championship again, we’ll have to wait and see.
“I think he can win on the regular tour and when he does that, I think he’ll have confidence when he comes to a major.
“We know that Tiger tees it up thinking he can win every event he plays in.”
He added: “I think we have to temper our optimism because we see him play and we say, ‘Oh my gosh, he’s going to be like he was in 2000 and 2001’.
Butch Harmon believes Tiger Woods will be competitive at the majors
Tiger Woods finished tied-ninth at the Hero World Challenge
“But these kids are pretty good these days that he’s coming out against. The beauty of what we saw with Tiger there is how much they’re into Tiger Woods.
“All of these guys – the Rickies, the Justin Thomas’s, the Spieths – they are in the game today because of Tiger Woods.
“For them to have had a chance to go head-to-head with him, they were loving it.”