Australia's champion jockey and former Hong Kong star Damien Oliver has had successful surgery to fuse two cracked vertebrae in his neck after a race fall, but the immediate future of his riding career remains unclear. Oliver, 31 - who rode in Hong Kong in the late 1990s and has visited for the International Races - had a bad fall at Moonee Valley in Melbourne last Thursday night. A marathon operation on Friday night to repair the neck damage was not completed until 2am on Saturday, but Oliver's business manager, Neil Pinner, said the surgeon was 'extremely happy' with the outcome. 'It is too soon to determine how long he will be out of the saddle,' Pinner said. 'Damien watched the races on television [on Saturday] and was in good spirits.' Oliver is expected to be sidelined from racing for two to three months. Pinner was reluctant to comment on his riding future. Oliver had decided before last week's accident at Moonee Valley to spend a month in Bali with his partner Trish and their daughter Niali. Close friends believe he may not ride again until the warm-up to the spring carnival. Others are speculating that the seriousness of the fall, in psychological terms, could see him bring down the curtain on a stellar career. Oliver's brother Jason died in a track fall in Western Australia in 2002, and his father died after a race fall in Western Australia in 1975. Oliver, who has won most of Australia's biggest races and has been champion jockey of Melbourne six times, has been a regular visitor to Hong Kong for feature meetings, the most recent being for the Mercedes-Benz Hong Kong Derby on March 13. His most recent feature success was the A$1 million ($6.08 million) Group One Newmarket Handicap (1,200m) at Flemington on champion sprinting filly Alinghi.