As the American men's team prepared to play Spain for the Olympic title, Krzyzewski told The Associated Press that the game will be his final one as national coach, a position he has held for seven years.
Krzyzewski had left open the possibility of staying with the team beyond the London Games, but before practice Saturday, he said these will be his last Olympics.
When asked if he was sure, Krzyzewski didn't hesitate before confirming.
Krzyzewski, who has led Duke University to four NCAA championships, took over the U.S. team in 2005. In the past seven years, he has restored the powerful American program, which was in disarray following a third-place finish at the 2004 Athens Games.
Led by Krzyzewski, the U.S. got redemption and a gold medal four years ago in China, won the world championships in 2010 and can win gold again by beating Spain.
"If we can win it, then it would be three major championships in a row, which I don't know when that's been done because we haven't usually won the world championships," Krzyzewski said. "It would be a huge thing for our program."
Although he won't take credit, Krzyzewski's impact on the U.S. program has been immense.
"It goes beyond what has happened on the floor," said USA Basketball chairman Jerry Colangelo, who hired Krzyzewski to run the U.S. team. "He's been so important to me in everything we've done in building the infrastructure and philosophy and standards — all of it. His legacy goes beyond the record on the court. We're 52-1, I guess, since this all began, and hopefully we'll be 53-1 after tomorrow. That's a legacy in itself."
Colangelo was asked if he would be able to persuade Krzyzewski to remain as coach.
"Chances are not," he said. "But we'll have to have that conversation on an official basis. He's said this is it, and I'll respect his choice. But knowing me as I know me, I'll have that conversation, and we'll see."
With a win Sunday, Krzyzewski would join Henry Iba (1964, 1968) as the only U.S. coach to lead the Americans to gold medals in consecutive Olympics.