Westbrook underwent the procedure on Sept. 12 and was slated to be re-evaluated in four weeks, which was Wednesday.
"Every day for him, he feels better and better," Thunder coach Billy Donovan said Thursday when asked if Westbrook will be ready for the Warriors. "I don't want to say (if he will play). I know you guys want to know that, but that's too far out and there will be a lot of things that will go into that decision.
"There are certain things he'll have to go through to get himself fully cleared to play, but he's certainly moving in the right direction and he's worked really hard at his rehab to get himself back."
Westbrook has participated in parts of practice in which contact is controlled.
"He's been in controlled situations that the medical staff has allowed him to do," Donovan said. "And hopefully with the way he responds physically after going through a workout, they'll be able to add a little bit more and more."
Westbrook, who turns 30 in November, holds career averages of 23.0 points, 8.2 assists and 6.6 rebounds per game in 748 games. He is a seven-time All-Star and won the 2016-17 MVP award.
(With inputs from agencies.)