Premier Gladys Berejiklian will be forced to renege on a promise to use the $2.6 billion sale of the land titles registry to pay for her stadiums policy and will have to find a new funding source.

The state government had committed to investing $1 billion from last year's sale of the Land and Property Information (LPI) to rebuilding and refurbishing two Sydney stadiums using the infrastructure fund Restart NSW, which holds the proceeds of major asset sales.

The rebuilding of Allianz Stadium will have to come from a new funding source. Credit:Wolter Peeters

NSW Treasury has confirmed the government would only pay for new stadiums from Restart NSW if the projects had a benefit-to-cost ratio of greater than one.

But the business cases for Allianz or ANZ stadiums do not achieve that ratio and a Treasury spokesman said the government would not be changing its requirements.