(UNDATED) – No.1 ranked Dustin Johnson has withdrawn from this week's CJ Cup at Shadow Creek in Las Vegas after testing positive for COVID-19. Johnson, according to the PGA Tour, was experiencing symptoms, prompting him to take a test. Players are tested prior to travel each week and on site as part of the PGA Tour's coronavirus testing protocols. In a statement, Johnson, a 23 time PGA Tour winner who captured the Tour Championship and thus the Fed Ex Cup title last month, says he is very disappointed with having to withdraw. He says he was really looking forward to competing this week but will do everything he can to return as quickly as possible. Johnson says he has already had a few calls with the tour's medical team and appreciate all the support and guidance they have given. Johnson's agent says the golfer took an on-site test Sunday that was negative. But he started feeling symptoms Sunday night, stayed away from the course Monday and didn't feel better Tuesday, so he took a test that came back positive. Because the symptoms began Sunday, it is possible that Johnson could return at next week's Zozo Championship as long as his symptoms have subsided. He would not be able to practice on site prior to the tournament. Tony Finau withdrew from last week's Shriners Hospitals for Children Open because of a positive test. He also withdrew from the CJ Cup field and has been replaced by Robby Shelton.