World number three Rory McIlroy has withdrawn from next week's PS5.7million ($A9.1 million) Turkish Airlines Open, the first of the European Tour's three Final Series events.
No reason was given by the four-time major winner's manager when he informed Tour officials of the decision on Saturday.
McIlroy is currently contesting the WGC-HSBC Champions in China and had spoken of his desire to win at least one of his last three events this season - in Shanghai, Turkey and Dubai - to try to win the Race to Dubai for a third year in succession.
The 27-year-old, who is more than a million points behind leader Danny Willett, was set to be the star attraction at the Regnum Carya Golf & Spa Resort in Antalya after Tiger Woods pulled out, the 14-time major winner saying he needed more time to work on his game after a long injury lay-off.
Earlier this month, European Tour officials investigated reports the southern Turkish holiday resort region of Antalya was hit in a rocket attack.
