The Paralympic Games will take place as planned next month, but face major budget cuts, the International Paralympic Committee has announced.
The cuts will be made to venues, the workforce and transport.
Delayed travel grants will now be paid to athletes, but 10 countries may struggle to get teams to Rio.
“Never before in the 56-year history of the Paralympic Games have we faced circumstances like this,” said IPC president Sir Philip Craven.
With 19 days to the start of the Games, the IPC says Rio’s organising committee has not raised enough money to fund the Paralympics.
This is due to Brazil’s struggling economy and the fact that only 12% of available tickets have so far been sold for the Games, which start on 7 September.
It meant organisers were three weeks late in paying 8m euros (£7m) in travel grants to help athletes get to Rio.
But Rio’s mayor Eduardo Paes has secured an additional £36m of funding and £24m in sponsorship from state-run companies after an injunction was lifted that had blocked further state aid for the Games.
What’s being cut?
Downsizing of Rio 2016’s workforce for the Paralympics
Changes to the transport services for athletes and their teams
The closure of a number of venue media centres
Moving events to other venues to enable Deodoro Park to be dismantled, allowing the other venues to have dedicated transport hubs
However, security forces currently in place for the Olympics will remain for the Paralympics.
Craven added: “These cuts are on top of the ones we, together with the International Olympic Committee, have already made in the last 12 months and are likely to impact nearly every stakeholder attending the Games.”
Organisers were meant to pay travel grants to all 165 participating countries by the end of July. The grants, paid to national Paralympic bodies, cover the travel costs for athletes and officials.
The first instalments will now be paid but the IPC is concerned that the delay could threaten some countries’ participation.
“Currently we have around 10 countries who, even if the grants are paid, may struggle to cover the cost of their travel to the Games,” said Craven.
The IPC also said only 290,000 tickets have been sold and it did not expect to see full venues in Rio.
Despite the problems Craven said the Games would “act as a catalyst to positive social change in Brazil and Latin America”.
He added: “We are working desperately hard to protect athlete services, especially within the field of play.
“They have dedicated their lives to reaching these Games and we will do our utmost to try to maintain the service levels and scope that they expect at a Paralympic Games.”