Lui Lai-yiu is the first high-profile woman in socially conservative Hong Kong to tell of abuse as part of the #MeToo movement exposing sexual misconduct.
In an open letter posted on Facebook on her 23rd birthday, Lui did not name the man who abused her as a young teenager, calling him "coach Y".
Lam, the city's first female chief executive, told reporters she was "very upset" to learn about the abuse.
"The police chief will certainly follow up in earnest," she said, urging other victims to come forward "as difficult this experience is" so that allegations could be investigated.
The #MeToo campaign spread rapidly in October after multiple accusations against Hollywood movie mogul Harvey Weinstein and has since shaken artistic, media and political circles globally.
Lui's post included a photo of her holding a sign that read "#METOO" with her initials "LLY" and her eyes cropped out of the shot.
She recalled how she thought nothing of it when the coach offered her a massage at his home to relax her muscles, but that he then removed her clothes and molested her.
"In my mind he was a coach I respected," Lui wrote. "I had never thought he would do despicable things to his students."
GMT 15:56 2018 Thursday ,04 January
Mountain bike world champ seriously hurt in car crashGMT 16:26 2018 Tuesday ,02 January
Browns end perfectly awful season -- 0-16GMT 17:31 2018 Monday ,01 January
FIFA claims attempt to contact doping whistleblower RodchenkovGMT 08:59 2018 Monday ,01 January
Lukaku carried off after clash of headsGMT 15:27 2017 Wednesday ,27 December
Djokovic determined to learn from injury miseryGMT 14:13 2017 Monday ,25 December
Southampton's Austin charged with violent conductGMT 18:37 2017 Tuesday ,19 December
West Ham's Lanzini charged over divingGMT 19:31 2017 Sunday ,17 December
Montpellier's Cruden suffers knee injuryMaintained and developed by Arabs Today Group SAL.
All rights reserved to Arab Today Media Group 2021 ©
Maintained and developed by Arabs Today Group SAL.
All rights reserved to Arab Today Media Group 2021 ©
Send your comments
Your comment as a visitor