U.S. cyclist Lance Armstrong waves during  the Astana team's presentation in Venice,  Italy, Thursday, May 7, 2009. The Giro  d'Italia, Tour of Italy cycling race is  scheduled to start Saturday, May 9 in  Venice. Lance Armstrong says he has  'high interest' from sponsors if he  takes over control of the Astana cycling  team. The seven-time Tour de France winner also says he would do everything he  could to keep Spanish rider Alberto  Contador if he does end up owning the  team.(AP Photo/Marco Trovati)

Lance Armstrong, from USA, Astana, said, "You can't win the Tour de France when you are forty either, so you have to understand that at some point the sun sets. I mean, I could very well be past that point now and putting myself up for a lot of suffering."

Armstrong will support Leipheimer in his bid to win the 100th anniversary edition of the biggest multi-stage race after Le Tour.

Editor:Zheng Limin