The 26-12 months-outdated will still be qualified to compete in upcoming year’s postponed Tokyo Olympics.
He also resigned as captain of Japan’s national swimming team, according to information agency studies, and has been requested to show up at educational systems by the federation.
The Japan Swimming Federation did not react to CNN’s requests for remark.
“I choose this disposition critically and apologize after once again to all the persons worried and those who guidance me for leading to issues around my conduct,” said Seto.
“I have been inquiring myself how I can apologize to the people, but I think my apology is to continue on to make endeavours in swimming.
“I would like to seriously facial area swimming with determination to commence over so that I can get back the believe in of my family members who have been deeply hurt by my irresponsible behavior and be regarded as a swimmer by equally my family and everyone. I’m pretty sorry.”
Seto is the reigning entire world winner in the 400m and 200m individual medley events.
He has also agreed to sever sponsorship ties with All Nippon Airways, according to Reuters