The world number 16 revealed he would take time off the professional golf tour on Thursday, before reports emerged Johnson's layoff was enforced.
A statement on the Tour's official website insisted the 30-year-old's break was voluntary.
"With regard to media reports that Dustin Johnson has been been suspended by the PGA TOUR, this is to clarify that Mr. Johnson has taken a voluntary leave of absence and is not under a suspension from the PGA TOUR," the statement read.
Golf.com reported Johnson failed a drug test for a third time, having allegedly tested positive for marijuana in 2009 before two showings of cocaine in his system in '12 and '14.
Johnson said on Thursday via a statement that he was leaving the Tour temporarily in order to address "personal challenges".