Former NSW Labor minister Ian Macdonald and ex-union boss John Maitland are selling their rural homes ahead of a public corruption inquiry into allegations Mr Macdonald set up a mining licence that netted Mr Maitland at least $10 million.

Premier Barry O'Farrell has been urged to stop the sales amid concerns the pair are trying to move their assets before any possible charges are laid as a result of the ICAC hearings, The Daily Telegraph reports.

Mr Maitland, the former national secretary of the CFMEU, is reportedly selling his 420 hectare property at auction on March 16, two days ahead of an ICAC hearing into a deal regarding the Doyle's Creek "training mine" in 2008.

A real estate agent has also confirmed Mr Macdonald's property in Orange is under contract.

Greens MP John Kaye demanded action from the premier on both Mr Macdonald's and Mr Maitland's sales, saying a freezing order should apply.

Opposition Leader John Robertson said Mr O'Farrell should seek urgent advice from the Crime Commission on whether the sale of the properties can be stopped.

ICAC is yet to hand down the findings of its inquiry and no charges have been laid against Mr Macdonald or Mr Maitland.

A spokesman for the premier's office on Sunday told The Daily Telegraph the Crime Commission had existing powers in the area and is monitoring the ICAC proceedings closely.