"They've got a very good scrum, their set-piece is very good, and they've got a really good coach. He's brought a lot of structure into the team, so they'll be organised."
The Maori All Blacks have a 16-match consecutive winning record against international sides that dates back to 2003, and Cooper said the new players were mindful of upholding that high standard.
"There's a legacy that's gone before them [that] we have to make sure we continue."
Cooper said the players' obligations extended beyond their performances on the pitch.
"There's an expectation off the field that they [will] represent New Zealand rugby and Maoridom. They have to understand [that]," he said.
That message seemed to have got through to Manawatu's Jason Emery, who will start the game at centre. He said it was a privilege to play for the team.
"It's going to be a big step up from the ITM Cup. I'm just looking forward to the challenge the Japanese are going to bring. I can't wait to get out there in the Maori All Blacks jersey."
NZ Maori v Japan
Kobe, 5.50pm today
NZ Maori
Robbie Robinson
Matt Proctor
Jason Emery
Charlie Ngatai (c)
James Lowe
Ihaia West
Chris Smylie
Elliot Dixon
Sean Polwart
Blade Thomson
Hayden Triggs
Tom Franklin
Mike Kainga
Ash Dixon
Chris Eves
Reserves: Codie Taylor, Brendon Edmonds, Nick Barrett, Nick Croswell, Dan Pryor, Jamison Gibson-Park, Marty McKenzie, Nehe Milner-Skudder