Four-time alpine World Cup overall champion Lindsey Vonn has been admitted to hospital in Vail, Colorado, with an undisclosed illness, her spokesman confirmed Monday. Lewis Kay declined to disclose any further details about Vonn, who cancelled a promotional event in Vail on Friday because she did not feel well. Vonn skipped a World Cup slalom in Finland at the weekend, preferring to prepare for the giant slalom and slalom set for Aspen, Colorado, on November 24-25. Vonn, who has won four of the past five women\'s downhill season crowns, had hoped to compete against men at Lake Louise, Canada, on November 24. However, that request was turned down by the International Ski Federation.