Japan attack coach Tony Brown believes having "two captains" will help their World Cup hopes.
The Brave Blossoms stunned Ireland to win their Pool A clash 19-12 last weekend and return to action against Samoa in Toyota City on Saturday.
Michael Leitch returns to the back row after starting on the bench against Ireland, although Pieter Labuschagne retains the captaincy.
"I think 'Lappies' and Leitch are both outstanding leaders," Brown said at the pre-match press conference.
"Obviously Lappies has been fully fit and playing fine in every game so far.
Listen to the RTÉ Rugby podcast on Apple Podcasts, Soundcloud, Spotify or wherever you get your podcasts.
"Michael has been in and out of the team this year so Lappies is a natural guy to take over.
"With the two captains running the team it will help the performance of the team and keep us sharp under pressure."
Japan are targeting a first World Cup quarter-final after falling in the group stage four years ago, despite winning three matches.
Beating Samoa would put them in a strong position to reach the last eight ahead of their final pool game against Scotland on 13 October.
"I just think it's been four years of hard work around our attack, building a skill set and being able to execute under real pressure," Brown said.
"Playing all the Tier One teams in the last four years and that experience helps the players to adapt to the extra pressure and more physicality.
"I think our players always expect to execute everything they do on the field."
Japan coach Jamie Joseph has also recalled hooker Atsushi Sakate and second-row Wimpie van der Walt.
Seilala Lam is one of six changes to the Samoa side beaten 34-0 by Scotland, the hooker joining his brother Jack, the captain and number eight, in the Pacific Islanders' line-up.
The squad received a special guest on Thursday as Samoa's Prime Minister Aiono Sailele visited them at their training camp.
Back-rower Chris Vui said: "It was good having him there telling stories. He spoke to us with a full heart and told some funny jokes just to keep the mood nice and chilled.
Then he gave us some words of encouragement leading up to (the match against) Japan, so it was good.
"After that Scotland game we still have belief in what we're trying to do.
"Japan is in our way but it's just another team we've got to get past to make that play-off."
