The five-time champion failed to register before Wednesday’s deadline.
LONDON: Ronnie O Sullivan will not defend his title at the UK Championship in York, which starts next month, governing body World Snooker announced on Thursday.
The five-time champion failed to register before Wednesday s deadline, meaning he will be absent from the line-up at the Barbican Centre in the northern English city.
O Sullivan, 39, edged Judd Trump 10-9 in last December s final, but has not played in a tour event since his quarter-final loss to eventual champion Stuart Bingham at the World Championship last April.
“The deadline for entering the tournament was yesterday and Ronnie has not entered, so he will not be competing in York,” said a World Snooker spokesman.
“We have had fantastic advance ticket sales and we re looking forward to a great event.”
The UK Championship runs from November 24 to December 6, with the winner taking home a cheque for $229,000.
O Sullivan has played in a number of exhibition events this year, but has not participated in any tournaments and recently opted against defending his title at next month s Champion of Champions event in Coventry.
In an interview with Eurosport this month, the Essex cueman said he had been advised not to compete on medical grounds due to his insomnia.
“Just as much as I d like to have been playing in the major competitions, my doctor has told me in no uncertain terms that he doesn t think it is wise for my health situation,” he explained.