PONTE VEDRA BEACH, Fla. — Tiger Woods’s sudden, unexpected withdrawal from the Players Championship on Thursday because of nagging pain from his surgically repaired left knee will have ripple effects well beyond this week.

Woods, 35, who still moves the needle more than any other golfer in the world, is now questionable for the Memorial Tournament in three weeks and is certainly no lock to be ready for the United States Open a month from now at Congressional Country Club in Bethesda, Md.

There is no window into the severity of his injury. Moments after he withdrew following a bogey at the ninth hole for a score of six-over-par 42, Woods said he could not tell whether he had aggravated the strain to his medial collateral ligament or to his Achilles’ tendon. He hurt both while hitting an awkward shot from under the Eisenhower tree at the Masters last month.

“I don’t know,” he said. “I just finished nine holes. Give me a few days to see what the docs say, and we’ll take a look at it.”