Former NSW premier Nathan Rees has reportedly been assaulted by a woman at a western Sydney shopping centre.

Police have confirmed they are investigating an attack by a woman on a 46-year-old man at Seven Hills shops on Wednesday afternoon.

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He did not require medical treatment.

Mr Rees was dumped as premier for Kristina Keneally in 2010.

He will retire from public office after 17 years at the March state election.