Japan manager Hajime Moriyasu on Monday stepped into the firing line for his players, telling media that he is ultimately responsible for what happens on the pitch at the 2022 FIFA World Cup in Qatar.

The 54-year-old former Sanfrecce Hiroshima boss fronted up a day after Japan missed a chance to book a place in the round of 16 with a miserable 1-0 loss to Costa Rica at Ahmed Bin Ali Stadium in Al Rayyan.

"I am entirely responsible for how the players perform. I am in charge of everything for the match, including player selections, tactics, and the way the players are asked to play," he said. "It is frustrating and unfortunate that we lost, I apologize."