YOKOHAMA -- With six weeks remaining before the start of the World Cup, Japan coach Philippe Troussier will be out to fine tune his team in Wednesday night's friendly against Costa Rica at International Stadium Yokohama, by giving a playing opportunity to those who haven't featured in the side much.

"I'd like to check various combinations and the composure of our team in the game against Costa Rica," said Troussier at a Yokohama hotel on Tuesday.

"Ninety percent of the team has been decided in my mind. I'd like to see how the remaining 10 percent perform and respond. As for those who make up the 90 percent, I'd like to see the tactical improvement to their game."