The 2017 champion hasn't played since the Masters last month.
Former champion Justin Thomas has withdrawn from this week's PGA Championship at Bethpage State Park, due to a wrist injury.
The world number five says he's 'disappointed' to miss the second major of the year but hopes to make a full recovery soon.
Thomas won the event at Quail Hollow in 2017 and was 12th at the Masters last month.
He's been replaced in the field by fellow American Kelly Kraft.
Thomas released a statement on Twitter.
— Justin Thomas (@JustinThomas34) May 13, 2019
"Unfortunately, I will be withdrawing from the 101st PGA Championship at Bethpage Black this week as my wrist is not yet fully healed.
"Obviously, as a past champion, this tournament is extra special to me.
"It consistently has the strongest field in golf and I'm disappointed to not be among those competing this year, but I'm optimistic about a return in the near future.