Okada upset with shadow Scotland squad
Scotland captain Darren Fletcher of Manchester United and Tottenham Hotspur defender Alan Hutton were the latest pullouts from coach George Burley's squad, which is also missing a host of established players such as Kenny Miller, James McFadden and Gary Naysmith.
Several players from Glasgow clubs Rangers and Celtic have also pulled out injured, forcing Burley to draft in a handful of uncapped players.
"We have only just heard now by telephone," Okada told Thursday's Japanese media. "Now we'll have to rethink all of our plans for who starts what matches."
Japan, who have qualified for next year's World Cup in South Africa, face Togo on Wednesday in Sendai in their second game of the three-team Kirin Cup tournament.