Hiroshi Sasaki proposed a section in the opening ceremony which involved Naomi Watanabe coming down from the sky dressed as a pig, according to the magazine Shukan Bunshun.
According to Kyodo News, Sasaki accepted he had made “a very inappropriate expression in my ideas and remarks”, and vowed to offer his resignation.
It is the latest controversy to hit the Tokyo build-up after organising committee president Yoshiro Mori resigned last month following a sexism row.
Sasaki claimed his idea had been intended as a play on the word ‘Olympic’ to ‘Olympig’, with Watanabe “wearing a cute pink costume and sticking her tongue out.”
Sasaki added to the magazine: “I thought that would make her look charming, but I was immediately reprimanded by male staff. I feel remorse.”