Treasurer Ben Wyatt's former media adviser Stephen Kaless. Credit:Linkedin

Police have spoken to the woman at the centre of an "inappropriate conduct" incident on Friday night that lead to the resignation of WA Treasurer Ben Wyatt's chief spin doctor.

Senior media adviser Stephen Kaless was suspended indefinitely and subsequently tendered his resignation on Monday after he was involved in "inappropriate physical conduct" toward a colleague at a Christmas function for Mr Wyatt's staff on Friday night.

Police are now looking into the incident and have spoken to the woman involved.

On Tuesday, WA Premier Mark McGowan revealed more details about the incident.