Postecoglou is less than a month out from his first match in charge of Yokohama F. Marinos, who open their J-League campaign away to Cerezo Osaka on February 25.

He said the shift back to the relative simplicity of club football had invigorated him after a four-year stint as Socceroos coach, during which he also became something of an unofficial figurehead for the game - a role that he now realises was a heavy burden to bear.

"When you're coaching your own nation there's a whole range of other forces that kind of weigh down on you that you don't really realise until you just get back to doing what I really love, which is coaching a football team," Postecoglou told SEN Radio.

"Being here now and not really worrying about crowd attendances or rating figures or whether youth development systems (are) going well and just purely concentrating on the thing I'm passionate about ... I'm really enjoying it."

Postecoglou treated his status as an Australian football statesman seriously, even releasing a book in 2016 that doubled as his manifesto for the future of the sport.

Many of his opinions contrasted with the actions or policies of his employers, Football Federation Australia, and it was rumoured part of his decision to quit the Socceroos was because the governing body's views didn't align with his.

"There's no doubt with any position you hold, there's always a sense that could you have done more and could I have carried on," he said.

"But right now, I'm enjoying the change and looking forward to the next phase.

"One of the frustrations again with international football was you'd get eight or nine fixtures a year and there's games aplenty here and an opportunity to get that adrenaline rush in a game fairly consistently."

Part-owned by the City Football Group, Yokohama F. Marinos haven't won the J-League since 2004.

Postecoglou said he was embracing his new life in Japan and was confident he could overcome the language barrier, which he admitted was a significant challenge.

"Words are very powerful, they're a tool I use a great deal in my coaching and not having that tool means that I've got to get creative about how to get the message across," he said.