Saudi Arabia will face Cameroon on Thursday having been branded failures by their coach.
Nasser al-Johar apologised in Saudi newspapers on Wednesday for his team's 8-0 capitulation in their opening match against Germany.
"We failed the nation and ourselves in an international arena," he said.
"Our squad was not expecting to play the way they did.
Everything was bad: manoeuvres, passing, defence and teamwork.
"This is not what we're used to."
Defeat against Cameroon in Saitama will make Saudi Arabia the first team to be eliminated from the competition.
Their final match is against Ireland on 11 June.