"The true Saudi team was the one that played against Uruguay, Denmark, Brazil in friendly matches and also
against Senegal," said the coach.
Saudi Arabia beat Uruguay and Senegal and lost narrowly to Brazil and Denmark in those warm-ups.
Al-Johar added: "I am so sorry for the spectators and for the people back in Saudi Arabia. But I am also responsible."
And he added: "I didn't expect this from my players. I'm very disappointed.
"Some players did not play very well at all but we have two
more matches to play and we can still qualify.
"We promise our fans in Saudi Arabia and in the Arab world to do our best in the next two matches."
Al-Johar has a mountain to climb to lift his team for Thursday's match against African champions Cameroon.
Saudi Arabia's former Asian Player of the Year, Nawaf Al-Temyat, hardly touched the ball on Saturday.
Only veteran striker and captain Sami Al-Jaber posed any threat in a match in which the German goalkeeper, captain Oliver Kahn, was completely untroubled.
Saudi Arabia's defeat was the worst in the finals since Hungary hammered El Salvador 10-1 in 1982.