Cameroon team manager Victor Agbor Nso told the country's state broadcaster it was unfortunate for the country and its global image.
The largest sporting event to be staged in Australia this decade, the Gold Coast 2018, will feature the largest integrated sports programme in Commonwealth Games history, comprising 18 sports and seven para-sports.
"The Cameroon Commonwealth team is sad to announce that eight ... athletes they took to the 21st Commonwealth Games in [the] Gold Coast ... are missing from their respective rooms in the Games village", Victor Agbor Nso, Team Camerooan chef de mission, said.
According to reports a Rwandan athlete, two squash players from Sierra Leone and two athletes from Uganda - have also disappeared.
Disappearance of African athletes at overseas competitions is something that has often happened.
Yombo was due to fight Canadian Harley O'Reilly in Wednesday night's men's 81-kilogram boxing quarter-final four.
Officials with the team have said they are "disappointed" and admitted the eight athletes, comprised of five boxers and three weightlifters, are not likely to return.
Commonwealth Games organisers called for competitors to respect the law, mindful of the fact that more than 100 athletes overstayed their visas at the 2000 Sydney Olympics.
Three left the on Sunday night, two more the following day and then three more on Tuesday night.
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Cameroon press attache Simon Molombe told Fairfax Media the athletes' whereabouts were unknown.
Six had finished competing, while the two boxers left the village without taking part in their events.
"We would appreciate them sticking within the law, enjoying themselves, but sticking within the law", Beattie said.
He told news.com.au he "doesn't think they'll come back".
"But these athletes are guests here in Australia, they are still within their visas and they have the right to travel freely", Mr Grevemberg said.
The athletes' visas are yet to expire, with authorities aware of the incident but not now pursuing a missing person's case.
"It's obviously disappointing that some of the athletes who've come didn't compete as they were scheduled to compete", he said.
"There's no reason why they couldn't have returned here, but to do that without it being obvious to someone, they would have had to either arrange for transport prior to leaving Warwick and I don't believe the team was in communication with members of our public for long enough to develop that sort of relationship".