Professor Green is being investigated over an alleged hit and run.
Albert Stanford, 67, claims he caused £800 damage when he reversed a loaned Mercedes into his Vauxhall Vectra. The pensioner was unable to get the rapper's insurance details as he had driven off by the time he got downstairs.
He told The Sun: "It made a loud smash. But by the time I got my dressing gown on and went down, they had driven off."
Albert then contacted the star's grandmother, who lives nearby in Woodford Green, north London, after neighbours told him the music star - whose real name is Stephen Manderson - owned the car involved.
Professor Green rang Albert to talk about the incident, but Mercedes-Benz have confirmed the loan car was left undamaged following the collision.
The rapper said: "The matter is being looked into."
A Met Police spokesman explained: "This is being treated as a fail-to-stop collision."
