Club president Massimo Cellino had slammed "bureaucratic difficulties and the collective disinterest of the authorities" in a statement on Saturday and invited fans to attend the game despite a ruling on Thursday that it should be closed to the public.
In the latest blow to Italian football's credibility, Serie A confirmed on its website that the Cagliari municipal government had ordered the game to be postponed on Sunday morning following a late-night meeting.
"Cagliari football club, represented by President Massimo Cellino, its members and everyone who works for the club, can no longer see a future due to the bureaucratic difficulties and the collective disinterest of the authorities," said the statement.
"We invite and ask all the fans and season ticket to come to the stadium and watch Cagliari-Roma in the full respect of order and civility.
"Cagliari football club and its engineers consider the structure to be adequate and secure.
"This act, absolutely peaceful, has been forced on us by the pain and frustration of defending our right to exist."
There was no mention on Cagliari's website on Sunday morning about the postponement of the match.
The municipal government said in a statement: "[Our] decision was necessary because of the urgent and serious need to prevent any form of disruption to order and public safety resulting from the emotional reaction... and the invitation made by the President of Cagliari football club."
Cagliari played at the Stade Sant'Elia from 1970 until around halfway through last season but abandoned the arena due to disagreements with the local authorities and because of growing safety worries.
Falling attendances, financial difficulties and dilapidated stadiums have also taken their toll, with Italian clubs no longer able to attract the world's top players.
