Portugal fielded a squad of three equestrian riders into the Olympic team dressage competition by finishing eighth overall and securing the last of three available berths for Group A and B at the European Championships in Rotterdam, Netherlands.

Rio 2016 Olympian Ana Filipa Martins booked a spot in the women's individual all-around and apparatus events, by finishing last out of the twenty gymnasts eligible for qualification at the 2019 World Championships in Stuttgart, Germany.

All of them, with Telma Monteiro (women's lightweight, 57 kg) leading the nation's roster at her fifth straight Olympics, were selected among the top 18 judoka of their respective weight classes based on the IJF World Ranking List of June 28, 2021.

[15][16] Portugal qualified one boat in the men's lightweight double sculls for the Games by winning the silver medal and securing the first of two berths available at the 2021 FISA European Olympic Qualification Regatta in Varese, Italy.

Frederico Morais secured a qualification slot in the men's shortboard event for his nation, as the highest-ranked surfer from Europe at the 2019 ISA World Surfing Games in Miyazaki, Japan.

[25] On the women's side, Rio 2016 Olympian Fu Yu scored an outright semifinal victory to book one of three Olympic spots available at the 2019 European Games in Minsk, Belarus.

[26] Shao Jieni was automatically selected among the top ten table tennis players vying for qualification to join Yu in the same event based on the ITTF Olympic Rankings of June 1, 2021.

Rio 2016 Olympian and double world medalist Rui Bragança secured a spot in the men's flyweight category (58 kg) with a top two finish at the 2021 European Taekwondo Olympic Qualification Tournament in Sofia, Bulgaria.