The Daily Mail says the 33-year-old was reportedly left 'badly shaken' after the attack outside a convenience store near his luxury home.
He was alone and had just got of his Range Rover when he was confronted by the mystery attacker before the man ran away.
Gerrard was not seriously hurt, but the incident in the wealthy village near Liverpool, where he lives with his wife Alex and three young daughters, has raised fears about the family's security.
Merseyside police have confirmed they are investigating a case of common assault over the incident which happened in August.
Soon after the attack, a female police officer was arrested in an investigation into whether an attempt was made to obtain CCTV footage of the attack taken from a nearby shop.
She was questioned by detectives on suspicion of committing misconduct in a public office.
A Merseyside Police spokesman told the Sunday Mirror: "As a result of this investigation, a female officer who has been on a career break since early this year is being investigated in relation to potential misconduct in a public office. It would be inappropriate to comment further at this stage."
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