THOUSAND OAKS, Calif. -- Bernhard Langer has a left knee injury that could force him to withdraw from the PowerShares QQQ Championship, the inaugural Charles Schwab Cup Playoffs event.Im not sure Ill be able to play tomorrow, but Ill make that call at noon when my tee time is, Langer said Thursday. For right now, Ive been getting treatment and trying to stay off my knee.Simply, the decision will come down to whether he can hit the ball.I tried yesterday and it didnt work, Langer said. I cant transfer my weight. I cant put any pressure on my left knee.The 59-year-old German star leads the 50-and-over tour with four victories and has wrapped up the season money title with $2,697,459.I had an MRI on Monday because I couldnt walk properly and just had problems, Langer said. Obviously, havent hit a shot yet, havent been out on the course. I walked it, but I havent hit a shot yet because I cant, I cant put much pressure on my knee. Walking these hills is very difficult, especially downhill.The top 72 players on the money list earned a spot at Sherwood Country Club, the former site of Greg Normans Shark Shootout and Tiger Woods event that is now called the Hero World Challenge. The playoff field will be cut to 54 for the Dominion Charity Classic next week in Richmond, Virginia, and to 36 for the Charles Schwab Cup Championship the following week in Scottsdale, Arizona.Each dollar earned in the first two events is worth two points and will be added to the regular-season total. At the Charles Schwab Cup Championship, points will be reset so that any golfer in the top five can capture the Charles Schwab Cup with a win. Langer has a big enough advantage over second-place Miguel Angel Jimenez that he would keep the lead in the standings even if he doesnt play this week.I came all the way here from south Florida and committed to play, said Langer, a three-time Cup champion. But if Im going to do long-term damage, the last thing I want to do is try and play and do further damage and then I cant play next week or the following week, which that would really be bad if I cant play the Schwab Cup. You know, the priority is to get my health. You cant play golf if youre not healthy. The game is hard enough when youre healthy; you dont need to be injured.Fred Couples is attempting to play after sitting out eight months with a back injury.Im honestly hoping to get through this, the 57-year-old Couples said. Its one of my favorite golf courses, so I found out last week that I was in the playoff. I havent played since February, so I thought, You know, Ill commit. I hit balls on Friday before I committed and actually felt OK.John Daly qualified 70th. He has five top-25 finishes in 14 starts since turning 50.All of us old guys have seen this course a few times, so theres no home-field advantage, Daly said. 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