Britain's world number three Paul Casey is out of this week's Barclays event in New Jersey, the first leg of the US Tour's FedEx Cup play-off series.
But Casey, suffering a rib muscle injury, hopes to return at the Deutsche Bank Championship in Boston next week.
"It has been a really frustrating few weeks and, of course, I was particularly disappointed to miss the PGA Championship," he said. "I had hoped to be back out on Tour this week. However, I feel pretty lucky that it wasn't more serious and that the injury has responded to treatment so well."
Three times a winner this season, the 32-year-old picked up the problem during a practice session before The Open at Turnberry last month.
He finished 47th there, but then had to pull out during the first round of the WGC-Bridgestone Invitational three weeks ago and missed the final major of the year.
He added: "I am really hoping that it continues to improve and I will be teeing it up in Boston next Thursday."
He is still undergoing a course of intensive treatment. It includes having a cortisone injection to the intercostal muscle to assist the recovery of both a tear and a strain.
Casey, who eight days ago lost his lead on the European "Race to Dubai" money list to German Martin Kaymer, lies 18th in the FedEx Cup standings.