Tiger Woods is still no closer to knowing whether he will be able to play in next month's Masters as he struggles with back pain.

The world No 1 withdrew from last week's Arnold Palmer Invitational in Florida because of his aching back and remains unsure if he will be fit for this year's first major, starting on April 10 at Augusta National.

"For Augusta, it is actually a little too soon to be honest with you," he told reporters on Monday at a sponsorship announcement for the AT&T National.