That's why he was a surprise guest at Easts pre-season training last week and then joined two former teammates for an over-35s training session after his return to Japan was cancelled.

Wallabies centurion and former ACT Brumbies skipper Giteau has been caught-up in the worldwide disruption as coronavirus fears continue to grow.

He was initially back home for a brief trip to visit family after Suntory coaches granted him special leave.

But his planned return to Tokyo last weekend was put on hold after the Japan government postponed all sporting events for at least two weeks.

The silver lining to the longer-than-expected homecoming was a chance to train with Canberra club Easts and link with Adam Ashley-Cooper and Drew Mitchell for a rugby reunion.

The 37-year-old is in the midst of a remarkable 20^th season as a professional player and is yet to decide whether he'll continue beyond this year.

Organising a session with Easts, a foundation club in Canberra's premier division, was the perfect chance to go back to where it all started.

"I think I got more out of it than them," Giteau said of his return to Canberra clubland.

"Just being able to train and enjoy it. That's why you start playing and that's why all of those guys play the game.

"There was a guy running around with his strapping as loose as his shirt ... that reminds you what rugby is all about.

"It was a nice little reminder for me and was a great opportunity to have a run around with the guys at Easts."

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Giteau is set to return to Japan at the end of the week, but travel plans and playing schedules are up in the air as health officials take extra precaution to prevent further spread of the virus.

Japan's rugby, soccer and baseball competitions have been affected, with 900 reported cases of coronavirus infection in the country.

The J-League has delayed 94 matches, the Top League has postponed 16 games and baseball will be played in empty stadiums.

The Brumbies were supposed to fly to Osaka this week, but their clash against the Sunwolves has been moved to Wollongong instead.

The Sunwolves will spend two weeks in Australia as Super Rugby officials decide whether they will have to reschedule the rest of their home matches this season.

But Giteau has no concerns about heading back to rejoin Suntory, instead soaking up unexpected time with family as he prepares to become a dad for the third time later this year.

"There were no concerns when I left, it's all just happened since I've been back," Giteau said.

"I'll wait to see what's happening, what the team is doing and when we're going to be training.

"Obviously people in higher places make this decision, all I can do is be at training when we train and be right to play whenever that is. But I've got no concerns about going back."

Giteau left the Brumbies at the end of 2011, joining glamour club Toulon on France before moving to Tokyo to link with Suntory three years ago.

He finished his Wallabies career after a World Cup comeback in 2015, quietly announcing his international retirement to focus on his twilight years.

This year he has teamed up with former Wallabies centre Samu Kerevi at Suntory and has been squaring off against former Brumbies Christian Lealiifano and David Pocock.

But is this the final chapter of a glittering career, which started in 2001 and has included three World Cups, Super Rugby titles, Japanese triumphs and European glory?

"Right now it's just year by year ... I'm still enjoying my footy and I'm not really looking ahead," Giteau said.

"I'm basically waiting to see how I feel. It could be my last year, but I haven't set any time on it because I don't want to rush into anything. I'll just wait to see what happens at the end of the year."