The 25-year-old double World Championship medallist will race in the 10 kilometres event in the French capital, where competition is due to take place in the River Seine.

She had won a silver medal in the 10km event at this year's World Championships in Fukuoka and was part of the Australian 4x1500m relay open water event that claimed a bronze medal.

Gubecka also swam at Rio 2016, where had finished 15th. 

"It doesn’t feel real at all," the 25-year-old from Queensland said.

"To be the first athlete selected is such an honour.

"To go to one Olympics is special but to be a dual Olympian is unbelievable.

"I was only 17 when I made my first Games so I probably didn't soak in the experience as much as I should have, but this is really special.

"I have such an amazing support system, my partner, our two dogs, my team at Yeronga Park, my coach Kate Sparkes," she said.

"To get the call that I was officially selected as the first athlete for Paris just gave me goosebumps."

Australia's Chef de Mission Anna Meares added: "This is a fantastic milestone for Chelsea and the entire Australian Olympic team," she said.

"Chelsea is the first athlete selected of an expected team size of 460 to 480 that will represent Australia with pride at the Paris 2024 Olympic Games.

"Winning 10km World Championship silver and mixed relay bronze in July this year, Chelsea has shown she is a world-class swimmer. 

"Congratulations Chelsea on being selected for your second Australian Olympic Team.

"This is also a day to celebrate for all those who have contributed to Chelsea’s Olympic journey - Swimming Australia, the Australian Institute of Sport and Queensland Academy of Sport, her coach Kate Sparkes, Yeronga Park Swimming Club, family, friends and supporters who have helped Chelsea become the athlete and person she is today."