The Commonwealth Games Federation head has demanded the Indian government take immediate steps to improve conditions at the athletes' village in Delhi.
Team delegates described the accommodation as filthy, unhygienic and unfit for human habitation.
But organisers of the event, which runs from 3 to 14 October, said they would provide an "excellent facility".
Meanwhile, at least 19 people were injured as a footbridge collapsed near the main Games venue.
Continue reading the main story
Analysis
Sanjoy Majumder
BBC News, Delhi
This is the latest embarrassment for organisers of Delhi's Commonwealth Games.
The Games village - made up of several blocks of high-rise luxury flats for the athletes who are due to begin arriving on Friday - was meant to be the event's showpiece.
The chief of the organising committee, Suresh Kalmadi, had said it would be better than the village at the Beijing Olympics.
Now his words are coming back to haunt him. Advance teams have described the state of the flats as shocking.
The village itself has been built on the banks of the Yamuna river. Just outside it are pools of green, stagnant water left over from flooding after Delhi's worst monsoon in three decades.
It's a breeding ground for mosquitoes and has raised fears of disease - there have been nearly 100 cases of dengue fever over the past month.
The organisers now certainly have their work cut out.
The steel walkway was being built to link the car park with the Jawaharlal Nehru stadium.
It is the latest setback to an event which has been plagued by construction delays, allegations of corruption and mismanagement, and a dengue fever outbreak in the Indian capital.
New Zealand, Scotland, Canada and Northern Ireland have demanded their teams be put up in hotels if their accommodation is not ready.
Team Scotland said in a statement that on arrival in Delhi last week their officials found "its allocated accommodation blocks were far from finished and in their view, unsafe and unfit for human habitation".
Commonwealth Games England called on Tuesday for "urgent" work on the facilities, raising concerns about "plumbing, electrical and other operational details".
Michael Fennell, the Commonwealth Games Federation president, said he had written to the Indian cabinet secretary urging immediate action.
He said "many issues remain unresolved" and the athletes' village was "seriously compromised".
Although advance parties from participating nations had been impressed with the international zone and main dining area, he continued, they had been "shocked" by the state of the accommodation itself.
"The village is the cornerstone of any Games and the athletes deserve the best possible environment to prepare for their competition," Mr Fennell added.
The collapse of a footbridge near the main venue is the latest setback
Two days before the village officially opens to the first of 7,000 athletes and officials, New Zealand chef de mission Dave Currie warned that organisers would struggle to finish everything in time.
There was even a possibility the Games could be cancelled, he added.
He said toilets in the accommodation were leaking and did not flush, and there were piles of building debris in bathrooms.
He told New Zealand commercial radio on Tuesday: "If the village is not ready and athletes can't come, obviously the implications of that are that it's not going to happen.
"It's pretty grim really and certainly disappointing when you consider the amount of time they had to prepare."
“
Start Quote
I can assure everyone there is no cause for worry”
Randhir Singh
Organising committee
Delhiites lose patience
In Melbourne, Australia's chef de mission, retired marathon runner Steve Moneghetti, said the hosts "have got two days to do what's probably going to take about two weeks".
But organising committee vice-chairman Randhir Singh told reporters in Delhi that everything would be ready on time.
"I can assure everyone there is no cause for worry," the news agency AFP quoted him as saying. "Delegates have praised the village as one of the best.
"We are working round the clock to take care of any problems. When the athletes arrive here, they will find an excellent facility."
There have also been safety concerns surrounding the Games, heightened on the weekend after gunmen on a motorcycle shot and wounded two tourists near Delhi's Jama Masjid, one of India's biggest mosques.
Team delegates described the accommodation as filthy, unhygienic and unfit for human habitation.
But organisers of the event, which runs from 3 to 14 October, said they would provide an "excellent facility".
Meanwhile, at least 19 people were injured as a footbridge collapsed near the main Games venue.
Continue reading the main story
Analysis
Sanjoy Majumder
BBC News, Delhi
This is the latest embarrassment for organisers of Delhi's Commonwealth Games.
The Games village - made up of several blocks of high-rise luxury flats for the athletes who are due to begin arriving on Friday - was meant to be the event's showpiece.
The chief of the organising committee, Suresh Kalmadi, had said it would be better than the village at the Beijing Olympics.
Now his words are coming back to haunt him. Advance teams have described the state of the flats as shocking.
The village itself has been built on the banks of the Yamuna river. Just outside it are pools of green, stagnant water left over from flooding after Delhi's worst monsoon in three decades.
It's a breeding ground for mosquitoes and has raised fears of disease - there have been nearly 100 cases of dengue fever over the past month.
The organisers now certainly have their work cut out.
The steel walkway was being built to link the car park with the Jawaharlal Nehru stadium.
It is the latest setback to an event which has been plagued by construction delays, allegations of corruption and mismanagement, and a dengue fever outbreak in the Indian capital.
New Zealand, Scotland, Canada and Northern Ireland have demanded their teams be put up in hotels if their accommodation is not ready.
Team Scotland said in a statement that on arrival in Delhi last week their officials found "its allocated accommodation blocks were far from finished and in their view, unsafe and unfit for human habitation".
Commonwealth Games England called on Tuesday for "urgent" work on the facilities, raising concerns about "plumbing, electrical and other operational details".
Michael Fennell, the Commonwealth Games Federation president, said he had written to the Indian cabinet secretary urging immediate action.
He said "many issues remain unresolved" and the athletes' village was "seriously compromised".
Although advance parties from participating nations had been impressed with the international zone and main dining area, he continued, they had been "shocked" by the state of the accommodation itself.
"The village is the cornerstone of any Games and the athletes deserve the best possible environment to prepare for their competition," Mr Fennell added.
The collapse of a footbridge near the main venue is the latest setback
Two days before the village officially opens to the first of 7,000 athletes and officials, New Zealand chef de mission Dave Currie warned that organisers would struggle to finish everything in time.
There was even a possibility the Games could be cancelled, he added.
He said toilets in the accommodation were leaking and did not flush, and there were piles of building debris in bathrooms.
He told New Zealand commercial radio on Tuesday: "If the village is not ready and athletes can't come, obviously the implications of that are that it's not going to happen.
"It's pretty grim really and certainly disappointing when you consider the amount of time they had to prepare."
“
Start Quote
I can assure everyone there is no cause for worry”
Randhir Singh
Organising committee
Delhiites lose patience
In Melbourne, Australia's chef de mission, retired marathon runner Steve Moneghetti, said the hosts "have got two days to do what's probably going to take about two weeks".
But organising committee vice-chairman Randhir Singh told reporters in Delhi that everything would be ready on time.
"I can assure everyone there is no cause for worry," the news agency AFP quoted him as saying. "Delegates have praised the village as one of the best.
"We are working round the clock to take care of any problems. When the athletes arrive here, they will find an excellent facility."
There have also been safety concerns surrounding the Games, heightened on the weekend after gunmen on a motorcycle shot and wounded two tourists near Delhi's Jama Masjid, one of India's biggest mosques.
