NEW YORK, (Reuters) – Tiger Woods is unsure when he  will play golf again after a painful neck injury forced him to  quit the Players Championship in Florida on Sunday.

The world number one said he would undergo scans this week  to determine the full extent of the problem.

“A lot is up in the air still, which I don’t like,” Woods  told a news conference in Pennsylvania on Monday.

“I still need to go home and get a picture of this and see  what’s going on.”

The American said he had been troubled by neck pain since  returning from self-imposed exile at last month’s U.S. Masters  but added it was not related to the car crash outside his home  last year that led to revelations about his infidelities.

”Zero connection. Absolutely zero,” said Woods. “My neck  started to bother me when I really started to practice a lot.”

Woods finished tied fourth on his return from a five-month  absence at Augusta National but has struggled since, missing the  cut at the Quail Hollow Championship in North Carolina before  pulling out during his final round at Sawgrass on Sunday.

“I can deal with the pain but once it locked up I couldn’t  move back or through. I couldn’t actually turn, going back, and  I couldn’t turn coming through,” he said.

“For me not to play all 18 holes, that was as angry and as  frustrated as I’ve been in a long time.

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“I’m going to start getting more treatment. I’ll have an MRI  scan on it and see exactly what’s going on, why it’s behaving  the way it’s behaving.”

Woods said he had planned to make his next appearance at the  Memorial Tournament in Ohio next month, an event he won last  year, then head to Pebble Beach for the U.S. Open but his plans  were now dependent on the test results.

“It actually started bugging me two weeks before the Masters  and it was just on and off. I thought it was just sore and no  big deal,” he said.

“But as I kept playing, kept practising, it never got  better. It actually was getting worse and now I’m at a point  where I just can’t go on any more.”

It is the latest setback for Woods who has struggled with  his knees in recent seasons and is still facing intense scrutiny  over his extra-marital affairs.

“There’s a lot of things going on in my life and I’m just  trying to get everything in a harmonious spot and that’s not  easy to do,” said the 14-times major winner.

“I’m also trying to make life changes as well and trying to  do that under the microscope of everyone asking me and watching  everything I do doesn’t make it easy.”