Top-ranked Dustin Johnson said Saturday that travel issues around golf tour events have prompted him to opt out of consideration for the US squad to compete at the Tokyo Olympics.

"It's a lot of traveling at a time where it's important for me to feel like I'm focused playing on the PGA Tour," Johnson said after Saturday's third round of the US PGA Tour's Players Championship.

The reigning Masters champion said last year he would not have played in the Japan Games had they been staged as planned in 2020 because he was making the US PGA's playoffs a priority and those events began two weeks after the Olympics.

The Olympics was postponed to July this year and Johnson won last year's FedEx Cup playoff crown to achieve that career goal.

But this time, he doesn't like the July 29-August 1 Olympic tournament being so close to the British Open, set for July 15-18 at England's Royal St. George's, and the WGC St. Jude Invitational in Memphis on August 5-8.

"I really didn't think much about it," Johnson said. "I actually didn't really ever decide whether I was going to play or not. I just didn't sign up.

"But it's right in the middle of a big stretch of golf for me, so that was the reason I was kind of waffling on it a little bit.

"It's a long way to travel."

Johnson qualified for the 2016 US Olympics but dropped out just weeks before the start due to concerns over the Zika virus in Brazil.

Johnson said he would have considered the Olympics more had there been more time between the $10.5 million WGC event and the Tokyo Olympics.

The four top-ranked American players after the US Open in June would qualify for the Olympics, provided all are in the top 15. This week, 11 of the top 15 in the world rankings are US players.

With Johnson out, the four Americans who would qualify currently include third-ranked Justin Thomas, fourth-ranked 2020 PGA Championship winner Collin Morikawa, fifth-ranked Xander Schauffele and sixth-ranked Bryson DeChambeau, the reigning US Open champion.

Leading the chase to overtake them over the next three months to play in Tokyo are eighth-ranked Masters winner and 2016 US Olympian Patrick Reed, world No.9 Patrick Cantlay, 10th-ranked Webb Simpson and four-time major winner Brooks Koepka, ranked 12th.

Simpson said Tuesday he wasn't likely to play in Tokyo if he did move up and qualify.

"Nothing against the Olympics, but I'm personally more interested in trying to win majors, The Players Championship, the FedExCup than be a medalist in the Olympics," Simpson said.