"He has returned to Singapore where a full investigation will be undertaken. We will also work closely with the Australian and Singaporean authorities to ensure they are supplied the information they require."
The incident meant the plane could not get to Wellington and its return flight to Melbourne was also cancelled.
Twitter user Muteki iikun was supposed to be a passenger on the flight and posted that he was going to miss Saturday night's All Blacks-Springboks test in Wellington as a result.
"@SingaporeAir care to try to explain why your captain (ie most experienced person on the aircraft) of SQ247 waits until boarding time to decide they're too ill/drunk to fly?," he Tweeted.
Schubert said Singapore Airlines apologised to those affected by the cancellation of these flights, however, the safety of their customers and crew is their highest priority.
"We have worked with customers whose travel was inconvenienced to find suitable alternate travel arrangements as quickly as possible," he said.
