World No. 1 Dustin Johnson withdrew from this week's Valero Texas Open on Monday in order to prepare for next week's Masters.

The PGA announced Johnson's withdrawal on Monday afternoon and Johnson later released a statement through the entity.

"After much careful thought over the weekend, I have decided to withdraw from the Valero Texas Open," Johnson said in the statement. "I now plan to spend the week at home in preparation for next week's Masters. I sincerely apologize to the sponsors at Valero and all my friends in San Antonio, as I realize this is disappointing news."

Just six hours before the PGA revealed Johnson wouldn't be playing in the event, Valero Texas Open organizers had announced Johnson had committed to play in the event in San Antonio. Johnson reportedly agreed to play prior to Friday's deadline.

Ryan Brehm will replace Johnson in the field.

The Valero Texas Open is a tune-up event for the Masters. Johnson won at Augusta last year to be fitted with his first green jacket.

Johnson was named PGA Player of the Year last season, the second time in which he has won the honor.

The Valero Texas Open runs Thursday through Sunday.