Lance Armstrong sat down with Oprah Winfrey for her show Oprah's Next Chapter to discuss his controversial cycling career and drug allegations. Winfrey calls it "the biggest interview I've ever done."

When asked if Armstrong, 41, admitted that he used performance enhancing drugs, Winfrey adds, "I would say he didn't come clean in the manner I expected. He was just ready. . . He had certainly prepared himself for this moment."

Just yesterday, the AP reported that Armstrong gave an "emotional" apology to his Livestrong staffers before taping the Oprah interview.

The International Cycling Union, which chose not to appeal the USADA's lifetime ban, stripped Armstrong of his record seven Tour victories.

The interview will air Thursday, January 17.