The anonymous man had sued the actor for sexual battery and assault, among other things.
Read moreKevin Spacey
Video content
Video caption: Kevin Spacey appears in court on groping charge The actor denies a charge of indecent assault and battery stemming from a groping allegation in 2016.
By Christian Hewgill
Newsbeat reporter
Kevin Spacey: Met Police investigates three new allegations
Copyright: BBCBetween February and April of this year, police received allegations that the American actor sexually assaulted men in London and Gloucester.
This brings the number of claims against Spacey being investigated by London police to six - five complaints of sexual assault and one of assault.
The police have not confirmed the name of the person being investigated.