The PGA Tour has suspended American golfer Scott Stallings for three months for violating the organization’s anti-doping policy, a tour statement reported on Tuesday. "I discovered in February 2015 that I had inadvertently taken a supplement for the prior two months that was not permitted by the PGA Tour," Stallings, who is ranked 154th in the world, said in an official statement via the tour's official website.

"I did so on the recommendation of my physician due to chronic fatigue I had felt over a period of time -- not in any way for performance enhancement."

The PGA Tour started testing golfers in 2008 and Stallings was the third announced suspension.

“Whether I intended to or not, I took something that wasn’t allowed. I called a penalty on myself, that’s the best way to look at it,” Stallings told “I did it immediately, so much so it took [the tour officials] by surprise.”

The 30-year-old Stallings, who turned pro in 2007, has won three PGA Tour titles and has career earnings over $7 million. He won the Greenbrier Classic in 2011, the True South Classic (now known as the Sanderson Farms Championship) in 2012 and the Farmers Insurance Open in 2014.