Woods will make his latest comeback to the golf circuit on Thursday at the Hero World Challenge in the Bahamas.
The 41-year-old has not played since February when he was forced to withdraw from the Dubai Desert Classic with back spasms.
Woods underwent surgery for the fourth time in three years and believes he is now healthy enough to play golf again.
The 14-time major champion has been candid about his struggles during recovery and he revealed he did think he might not play golf again during his rehabilitation.
He said: “I don’t know if retirement was the word, but I didn’t think I could play golf with my friends again.”
Butch Harmon coached Woods for over 10 years and he reckons the American would not have returned if he didn’t think he could win.
He told Sky Sports: “I don’t think Woods would even play this week if he didn’t think he had at least a chance of winning.
“He has told us all along in every interview he has done that every time he enters a tournament, he has the desire to win.
“He wouldn’t have put himself out in the public spotlight if he wasn’t ready to perform. That’s the big thing we can take away from this, as Tiger wouldn’t allow himself to be mediocre.
“He has the speed back in his swing and has the freedom in his body to do the things that he’s trying to do. It’s not that he wasn’t trying to make good swings before, his body wouldn’t let him.
“Added with the pain, it was impossible for him to play, but now he appears to be pain-free and…