Disgraced cyclist Lance Armstrong visits his cancer charity's office to apologise to staff ahead of Winfrey interview
"He had a private conversation with the staff, who have done the important work of the foundation for many years," said foundation spokeswoman Katherine McLane.
The disgraced cyclist plans to admit in the interview to doping throughout his career, USA Today reported on Saturday.
Armstrong has always vehemently denied using performance-enhancing drugs and has never been proven to have tested positive.
But an October report from the U.S. anti-doping body USADA cited Armstrong's involvement in what it characterized as the "most sophisticated, professionalized and successful doping program that sport has ever seen," involving anabolic steroids, human growth hormone, blood transfusions and other doping.
Less than two weeks later, Armstrong's seven Tour de France victories were nullified and he was banned from cycling for life after the International Cycling Union ratified the USADA's sanctions against him.
Armstrong, a survivor of testicular cancer, stepped down as a Livestrong board member in November.