Former world number one Dustin Johnson has undergone surgery to repair cartilage damage in his left knee.
Johnson, who has slipped to third in the rankings after a poor finish to the PGA Tour season, underwent an arthroscopic procedure in Florida on Thursday, according to a statement released by his agent.
"He is now resting comfortably and is expected to make a full recovery before returning to competition later this fall," Johnson's agent, David Winkle, said.
Winkle said the procedure is considered routine and was similar to surgery on Johnson's other knee in December 2011. Both operations were performed by Dr George Caldwell.
Johnson was runner-up in the Masters and US PGA Championship, but since finishing second to Brooks Koepka at Bethpage in May the 35-year-old has finished no better than 20th in eight starts.
Although no date has been set for his return, Johnson has regularly competed in the WGC-HSBC Champions event in China, which starts on October 31. He also qualified for the United States' Presidents Cup team which will take on the International Team in Melbourne in December.
