World number one Rory McIlroy admits he has work to do to get his game in shape before attempting to compete a career grand slam at the Masters in April.
The 25-year-old was disappointed with his performance in the WGC-Cadillac Championship where he finished eight shots behind winner Dustin Johnson.
McIlroy's frustrating week included him tossing a three-iron into a lake.
"The game is just not quite there. I have got a week off now to try and work on it a little bit," said McIlroy.
"I am pretty disappointed with how I played overall. I felt it was a little better again on Sunday for the most part but a bit of a disappointing finish. But it's just not quite 100%."
In the tournament before the WGC event, the Northern Irishman missed the cut at the Honda Classic.
McIlroy was reunited with the club he threw into the lake ahead of Sunday's final round at Doral, Miami.
It was retrieved by a diver and presented to McIlroy on the range by Doral's owner Donald Trump.
McIlroy's closing round came to a comical end when he hit two balls into the water on the last, faked throwing another club in after them and then chipped in from the back of the green for a double-bogey six.
It added up to a closing 72 and a one-under-par total of 287, which was still good enough for a share of ninth place.
Afterwards McIlroy, who had been in good form in the lead-up to missing the cut at the Honda Classic, said some fear had crept into his game.
"I am tentative, a little bit scared to play certain shots, because I feel like I can't at the minute," added McIlroy.
"So, hitting away from flags, trying to make sure that I am missing it in the right areas. Just playing quite conservatively, which is very much unlike me.
"I have just got to get back at it and try to figure out what I need to do."