Rory McIlroy has pulled out of the Thailand Golf Championship, according to the event's entry list on Monday, after suffering a bout of dengue fever that has hurt his bid for the European number one spot.
The Northern Irishman, who lost out to England's Luke Donald for the European Tour top ranking in Dubai last week, had already warned that the mosquito-born illness could rule him out of the season-ending Asian event.
"Big thank you to everyone who has supported me this year, it has been a season to remember and hopefully 2012 will be even better!" said the US Open champion in his latest Twitter feed.
World number two McIlroy, who suffered exhaustion and a skewed blood count as a result of the illness, on Friday said he would consult a doctor before deciding whether to go ahead with the Thailand event.
"To be honest, I'm ready for the season to be done and looking forward to putting the clubs away," he said at the time.
McIlroy came joint 11th at the Dubai World Championship, seven shots behind Donald, who finished third to become the first player to top both the US PGA and European Tour money lists in the same year.
World number three Lee Westwood, Masters champion Charl Schwartzel, Japan's Ryo Ishikawa and local hero Thongchai Jaidee will compete at the inaugural tournament at Bangkok's Amata Spring Country Club.