Lance Armstrong has yet to decide if he will ride in next year's Tour de France.
The American, who retired in 2005 after his record seventh Tour win, announced on Monday he will race in May's Giro d'Italia for the first time.
Armstrong - who has returned to competitive action to help publicise his cancer foundation - was quoted as saying on the website of Gazzetta dello Sport: "There is the possibility that the Giro is the only three-week stage race that I will run. Still today, there are doubts over the Tour.
"Everybody knows its importance but the problems I have with the organisers, journalists and fans could be distracting for my mission - to focus world attention on the battle against cancer."
The 37-year-old Texan survived testicular cancer before going on to win the Tour de France every year from 1999-2005.

Latest Sky Sports News Report
Chelsea 1-0 Man Utd - Ferguson
Chelsea 1-0 Man Utd - Ancelotti
West Ham 1-2 Everton - Zola
West Ham 1-2 Everton - Moyes
Bring on the Klitschkos!
Wigan 1-1 Fulham - Martinez
Wigan 1-1 Fulham - Hodgson
Chris Burton catches up with Sam Stockley on the day the experienced defender hangs up his boots.
Liverpool undid their hard work of last week, Chelsea marched on while Arsenal claimed the derby spoils.