Tatekawa will have almost no time to settle into his new home as the Brumbies prepare to throw him immediately into action in their pre-season trial against the Otago Highlanders next week.

Former Brumbies and Australian coach Eddie Jones, and Wallabies great Toutai Kefu have backed Tatekawa, 24, to make a successful transition.

First he faces a challenge to understand his teammates and coaches as the Brumbies ramp up their preparations.

Tatekawa speaks minimal English and arrived in the capital this week, supported by his Kubota backs coach Taishi Furukawa who doubles as his translator.

But while off-field communication is minimal, Brumbies coach Stephen Larkham insists ''rugby has its own language''.

''We've got to get our structures in his head, but he's super keen to get in there,'' Larkham said. ''He's a playmaker … it's positive the way he's responded and by the end of the week he'll be more up to speed. Rugby has its own language, we speak in a different lingo here.''

Tatekawa met Larkham on Thursday afternoon for a crash course in the team's structures and plays. The five-eighth and inside-centre will test himself against the Highlanders in Queenstown on January 31.

Making it tougher is that Furukawa will return to Japan on Sunday, leaving Brumbies and Wallabies forward Scott Fardy as one of his only teammates who can speak Japanese.

Tatekawa is unfazed and wants to pave the way for more Japanese players to join Super Rugby. He will become just the second Asian player to play Super Rugby if he gets a chance this season.

''This isn't just a one-year plan, this is a three- or four-year plan for me and this is the first try,'' Tatekawa said through Furukawa.

''I want to improve the Japanese rugby level, to take it higher. The language barrier is a big challenge for me.

''Communication is a vital skill, my English has to improve. Eddie [Jones] said to take on the challenge and then [go] back to Japan [as a better player].''

Former Wallabies No.8 Kefu is the Kubota coach and Furukawa has been giving Tatekawa limited assistance to help him settle in.

Tatekawa has played 20 Tests for Japan and Kefu described him as the Japanese version of Brumbies five-eighth Matt Toomua.

Wallabies forward Fardy spent three years playing in Japan before signing at the Brumbies in 2012.

''They love rugby in Japan and there are quality players, it's good Haru is getting a chance and we need to develop the game globally,'' he said.

''In rugby, a lot of the terms we use are the same, so he should pick it up pretty quickly. Communication is always going to be hard and the physicality is different. But Haru looks at home already and he's a big boy as well.''

Tatekawa arrives as Brumbies skipper Ben Mowen continues negotiations with the Australian Rugby Union before his departure at the end of the year.

Fairfax Media revealed Wallabies captain Mowen will play in France next year, but he is yet to find out when he will be released.

He will play the season with the Brumbies before he departs.