The midfielder told Korean reporters on Wednesday that he felt that they had the steel to go all the way and win.
"I believe it will come down to mental strength," said Ki.
"That will be more important than physical strength," he added.
"This is a great opportunity for South Korean football."
South Korea have failed to win the Asian Cup since 1960, but do have the backing of the Asian community in and out of Australia to lift the trophy come Saturday.
"We understand the magnitude of the game without anyone telling us," said Ki.
Lee confessed he had no idea if he will even start in the final.
"I don't know if I'll play," he said before training. "It's not about personal milestones at all. All that matters is winning the title.
"People are talking about me because I've scored a couple of goals but my job is to score goals," he added.