Still to be determined is whether Harding Park needs to bother building stands for spectators.

"We believe that holding it without fans is a possibility, something we should try to do if we have to," said Seth Waugh, the CEO of the PGA of America.

The US PGA Championship is still months away and golf, much like other sports, doesn't have a starting line yet.

The PGA Tour was looking at the potential of a mid-June start, although plans can change quickly.

Even so, Waugh said the PGA is looking at various options to be prepared.

"Plan A is to play with fans at Harding Park," he said.

"Plan B is no fans.

"Plan C is to call an audible if indeed we need to try to play it somewhere we can safely."

Meanwhile, according to a British newspaper, the European Tour is warning its players that everything from prize money to player services will be different when golf resumes.

"Plan A is to play with fans at Harding Park. Plan B is no fans. Plan C is to call an audible if indeed we need to try to play it somewhere we can safely." – Seth Waugh, CEO of the PGA of America

The Daily Telegraph reported on Tuesday it has obtained a memo from chief executive Keith Pelley to members that outlines the sobering effect of the coronavirus that has shut down most global sports since early March.

Eight tournaments have been postponed. Five others, including the Open Championship, have been cancelled.

The next event still on the schedule is the BMW International Open in Germany from June 25-28.

Pelley said the pandemic has stopped the Tour's momentum in tournaments and prize money and will require it to reassess how it goes forward.

"The reality is, the pandemic is going to have a profound impact on the Tour financially, as well as many of our partners, both in sponsorship and broadcast areas," he said.

The European Tour started the year with a schedule of 46 events held in 31 countries, which includes the four majors and four World Golf Championships.

To salvage the season, Pelley suggested in the memo that when golf resumes, there could be multiple tournaments in the same location, two tournaments in the same week or as many as four tournaments in consecutive weeks in the United Kingdom – even playing "behind closed doors if necessary".