Lance Armstrong's RadioShack team has been left off the start list for the Tour of Lombardy next month.
The final race in the UCI's Historical calendar on October 16, brings the curtain down on the road racing season and remains one of the most prestigious one-day races on the calendar.
Disappointed at not being invited, RadioShack have lodged an appeal with the Court of Arbitration for Sport (CAS). The American team claims that they reached an agreement with organisers RCS sport over their participation back in January, but now seem to have fallen out with RCS boss Angelo Zommegnan.
"Totally surprised, Team RadioShack learned through the press, on September 6th 2010, that it was not included in in the list of teams participating at the Italian event," their press release said.
"Team RadioShack has immediately summoned RCS Sport before the Court of Arbitration for Sport in Lausanne seeking compensation for damages due to the non fulfilment of the contract between Team RadioShack and RCS Sport regarding the participation in the Tour of Lombardy."
The team is now struggling for end of season racing after also missing out on a place at the Tour of Spain. Without Armstrong for 2011, who has said he will cut back on his racing, and seemingly falling out with major organisers, the team may yet struggle to get invites next year.
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