Yuji Nakazawa, Yasuhito Okubo and Shunsuke Nakamura were on target as the hosts got their Group Two campaign back on track at Nissan Stadium.

The win will have come as a relief to Okada after their shock defeat to Bahrain last time out, but the coach does not believe his players saw the best of Oman on Monday.

"Nothing has been decided yet in our group and I don't think that the game we saw from Oman today is their normal game," he said.

"If we think we will get a similar type of game when we play them away, we could suffer greatly.

"But having said that, we've made a step forward with our win today. Our players fought hard as a unit to win the game and I'm grateful to them."

Oman coach Julio Rivas admitted the absence of several influential players proved their downfall in Yokohama, but is confident his troops can bounce back on home soil this weekend.

"Japan deserved to win but we had to play without five of our regular players and that really cost us," said the Uruguayan coach.

"If you miss four players from your backline, that makes it difficult to play against any team in the world.

"This time Japan took advantage of playing at home but it's our turn next. We'll take advantage of playing at home on Saturday to beat them there."