PISA, Italy, (Reuters) – Tour de France champion  Alberto Contador has not ruled out the possibility of being a  team mate of Lance Armstrong again despite their difficult  relationship when both were with Astana.

Seven-times Tour winner Armstrong has formed a new team,  RadioShack, for next season while Spaniard Contador will remain  with Kazakh-funded Astana in 2010, despite threatening to leave  and opening negotiations with several other leading teams. Contador and Armstrong clashed over the role of team leader  at Astana during this year’s Tour de France. However, Contador  said yesterday he had put their differences behind him.“I want to think about sport, I’m not interested in the polemics. For me 2009 is finished. Now I want to think about training for my own goals,” Contador, in Italy for an Astana training camp, told a news conference.

“Things were difficult during the Tour de France and it was  very stressful but it was also good experience for the future. I matured a lot and learnt to stay cool. “It’s possible that I could be friends or an ally with Lance in the future. In sport you can never say never.”    Contador said his only focus this year would be on the Tour de France because of the lack of experienced riders at Astana  following Armstrong’s departure, although Spain’s 2006 Tour de  France winner Oscar Pereiro signed a one-year deal earlier this  week.