The NSW sport minister has faced a storm of questions from his peers over his private property interests and a linked political donation.

John Sidoti was the parliamentary secretary for transport when the department designed a new access road to land he part-owned at Rouse Hill, which subsequently won approval for a $70 million high-rise precinct, News Corp Australia reported on Thursday.

It was also revealed the Liberal Party is forfeiting an illegal $1750 donation made in 2015 from a property developer who was partnering with Mr Sidoti on the project.

The minister on Thursday morning said in a statement: "I categorically deny all allegations made against me in the media in recent days."

"To suggest I used my position as a member of parliament to influence government decisions for my private interests are a gross misrepresentation of fact," Mr Sidoti said.

"My pecuniary interests are publicly available and I comply with my obligations."

Mr Sidoti subsequently fronted a NSW budget estimates hearing where he was grilled by Labor MP Walt Secord over the issue.

"I have complied with all my obligations," Mr Sidoti said multiple times on Thursday morning.

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