A new round of tickets has been put on sale from Thursday for Olympic gymnastics, canoeing and rowing, Rio 2016 organisers said.
An unspecified number of tickets in all price categories will be available from noon on Thursday via the official Rio 2016 website, Xinhua news agency reported.
The Rio 2016 organising committee has said it will put tickets on sale every Thursday for sessions there were previously unavailable.
Fans residing outside Brazil may buy tickets from authorised resellers in their countries.
More than one million tickets will be made available in the coming weeks as seating plans for venues were confirmed.