The investigation into historic sexual abuse by the late entertainer Jimmy Savile now includes an allegation stretching back to the 1980s at the now-closed Shenley Hospital.
The Central and North West London NHS Foundation Trust made officers aware of the alleged incident involving a teenager at the hospital.
A spokesman said: “CNWL is investigating a case from 1982 at Shenley Hospital, as the inheritor Trust for this site.
"The allegation is about a teenager who took part in a sports event held there when Savile was present.
"We have spoken to this person. Our report will be published in line with all the others.”
The hospital closed in 1998.
Other hospitals involved in a fresh wave of allegations are Birch Hill Hospital in Rochdale, Scott House Hospital in Rochdale, Bethlem Royal Hospital in London, St Martin's Hospital in Canterbury, Queen Elizabeth Hospital in Gateshead, and Meanwood Park Hospital in Leeds.