Asbestos has been found in 'small amounts' at the Allianz Stadium site, with the announcement coming just a week ahead of the date construction is scheduled to begin.

Infrastructure NSW released a fact sheet on the issue this week after the asbestos was discovered during testing late last year.

Asbestos was found in 'small amounts' on the site. Credit:Brook Mitchell

It said the amount of asbestos, which was found underground, is unlikely to be harmful to workers and will not affect the construction start date set for March 2020.

"Infrastructure NSW is aware of the Asbestos Contaminated Material (ACM) that has been identified in small amounts on the Sydney Football Stadium Redevelopment site," a spokeswoman said. "The type of ACM found is bonded asbestos material and any risk to workers and the public is extremely low."