Lee Westwood has accused the European Tour of "mismanagement" of their 2007 schedule after missing this week's Volvo Masters. A two-time winner on the Tour this year, Westwood will not take part in the season-ending event in Valderrama, having already committed himself to the Asian Tour's Singapore Open, which is being played at the same time.

The 34-year-old, 10th on the European Order of Merit, said: "I committed to playing in Asia very early on this year and I committed to play in the Singapore Open a long time ago as well, so the mismanagement on behalf of the European Tour as far as dates coinciding was very disappointing from my perspective.

The dates for the 2007 Singapore Open were announced in May last year, several months before the European Tour released its schedule for the season. Although Westwood was disappointed to miss out on the Volvo Masters, he claimed he had never considered pulling out of the Singapore event. "Once I sign a contract, I plan to stick to my word," the world number 31 added. "I'd like to have played in both the Singapore Open and Volvo Masters - hopefully that can be corrected in the future."

Asian Tour executive chairman Kyi Hla Han admitted it was unfortunate the dates of the tournaments had clashed. "The view of the Asian Tour was we had set a date for the Singapore Open a lot earlier and it was just unfortunate, at that time, the European Tour had not set a date for the Volvo Masters," said Han. "Right now, we're trying to communicate and see that this sort of thing doesn't happen again."