Dustin Johnson has decided not to compete at Tokyo 2020 ©Getty Images

World number five Dustin Johnson has become the first golfer to confirm he is planning to miss the Tokyo 2020 Olympic Games.

Johnson, who won the US Open in 2016, had previously been lukewarm over the prospect of competing at the Olympics.

The American has now decided to focus on the FedExCup playoffs, which will be held on August 16.

The Tokyo 2020 men’s Olympic tournament will run from July 30 to August 2.

“Dustin gave the Olympics a great deal of thought and we discussed the pros and cons of him participating at length,” Johnson’s manager David Winkle said to Golfweek.

“At the end of the day, it’s a matter of personal preference and priority. 

"As much as he would be honoured to be an Olympian, the FedExCup Playoffs are also very important to him.

“Having had a few close calls in the Playoffs, he really wants to win them before his time is done and feels that he wouldn’t be giving himself the best opportunity to do so if he added a lengthy international trip just prior to their beginning (and shortly after returning from two weeks in Europe).”

Dustin Johnson missed the Rio 2016 Olympic Games due to fears over the Zika virus ©Getty Images
Dustin Johnson missed the Rio 2016 Olympic Games due to fears over the Zika virus ©Getty Images

Johnson, who previously questioned whether the Olympics would fit into his schedule, currently is the third highest-ranked American player in the world rankings.

Brooks Koepka and Justin Thomas are above Johnson, with the former having also questioned the importance of the Olympic golf tournament compared to the sport’s majors.

The United States is almost certain to have the opportunity to send four men’s players to Tokyo.

Up to four top-15 players can qualify per nation, or two in the top 60.

Golf returned to the Olympic programme at Rio 2016 for the first time since 1904 but the move was not met with universal enthusiasm among the world's top professional players.

A large number of big names withdrew from the men's event citing reasons including the Zika virus, the lack of prize money and packed schedules.

Johnson was among the players to miss the tournament, with the Zika virus cited as his reason for not participating.

The top four in the world rankings at the time - Australia's Jason Day, Johnson, fellow American Jordan Spieth and Ireland's Rory McIlroy - missed the Games.

Interest in Tokyo appears greater, with four-times major champion McIlroy and the sport's icon Tiger Woods among the top names who have indicated their wish to play.

Calendar changes to fit around the Games include the World Golf Championships-FedEx St Jude Invitational moving from late July to the first week of the month.