armstrong072609_01_X17crop230crop.jpgLance Armstrong has apologized to his Livestrong staffers for using performance enhancing drugs during his career, according to AP.

The champion cyclist reportedly told his staff at the Livestrong organization in Texas "I'm sorry" for letting everyone down.

Armstrong, 41, is set to tape an tell-all interview in his hometown of Austin, Texas with Oprah Winfrey in which he admits to doping.

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

The Oprah interview will air this Thursday on OWN.